Diesel exhaust

British Rail Class 55 Deltic diesel locomotive with their characteristic dense exhaust when starting a train

Diesel exhaust is the gaseous exhaust produced by a diesel type of internal combustion engine, plus any contained particulates. Its composition may vary with the fuel type or rate of consumption, or speed of engine operation (e.g., idling or at speed or under load), and whether the engine is in an on-road vehicle, farm vehicle, locomotive, marine vessel, or stationary generator or other application.^[1]

Diesel exhaust is a Group 1 carcinogen, which causes lung cancer and has a positive association with bladder cancer.^{[2][3][4][5][6]} It contains several substances that are also listed individually as human carcinogens by the IARC.^[7]

Methods exist to reduce nitrogen oxides (NO_x) and particulate matter (PM) in the exhaust.

Contents

• 
  1 Composition
  


• 
  2 Exhaust gas composition according to various sources
  


• 
  3 Chemical classes
  
  
  
  • 
    3.1 Specific chemicals
    
  
  
  • 
    3.2 Water vapor
    
  
  
  
  


• 
  4 Regulation
  


• 
  5 Health concerns
  
  
  
  • 
    5.1 General concerns
    
  
  
  • 
    5.2 Occupational health effects
    
  
  
  • 
    5.3 Concerns regarding particulates
    
  
  
  • 
    5.4 Specific effects
    
  
  
  • 
    5.5 Variation with engine conditions
    
  
  
  
  


• 
  6 Ecological effects
  


• 
  7 Remedies
  
  
  
  • 
    7.1 General
    
  
  
  • 
    7.2 Selective catalytic reduction
    
  
  
  • 
    7.3 Exhaust gas recirculation
    
  
  
  • 
    7.4 Combined systems
    
  
  
  • 
    7.5 Other remedies
    
  
  
  • 
    7.6 Water recovery
    
  
  
  
  


• 
  8 See also
  


• 
  9 References and notes
  


• 
  10 Further reading
  


• 
  11 External links
  

Composition

The primary products of petroleum fuel combustion in air are carbon dioxide, water, and nitrogen. The other components exist primarily from incomplete combustion and pyrosynthesis.^[1][8]
While the distribution of the individual components of raw (untreated) diesel exhaust varies depending on factors like load, engine type, etc., the adjacent table shows a typical composition.

The physical and chemical conditions that exist inside any such diesel engines under any conditions differ considerably from spark-ignition engines, because, by design, diesel engine power is directly controlled by the fuel supply, not by control of the air/fuel mixture, as in conventional gasoline engines.^[9] As a result of these differences, diesel engines generally produce a different array of pollutants than spark-driven engines, differences that are sometimes qualitative (what pollutants are there, and what are not), but more often quantitative (how much of particular pollutants or pollutant classes are present in each). For instance, diesel engines produce one-twenty-eighth the carbon monoxide that gasoline engines do, as they burn their fuel in excess air even at full load.^[10][11][12]

However, the lean-burning nature of diesel engines and the high temperatures and pressures of the combustion process result in significant production of gaseous nitrogen oxides (NO_x), an air pollutant that constitutes a unique challenge with regard to their reduction.^{[not verified in body]} While total nitrogen oxides from petrol cars have decreased by around 96% through adoption of exhaust catalytic converters as of 2012, diesel cars still produce nitrogen oxides at a similar level to those bought 15 years earlier under real-world tests; hence, diesel cars emit around 20 times more nitrogen oxides than petrol cars.^[13][14][15] Modern on-road diesel engines typically use selective catalytic reduction (SCR) systems to meet emissions laws, as other methods such as exhaust gas recirculation (EGR) cannot adequately reduce NO_x to meet the newer standards applicable in many jurisdictions. Auxiliary diesel systems designed to remediate the nitrogen oxide pollutants are described in a separate section below.

Moreover, the fine particles (fine particulate matter) in diesel exhaust (e.g., soot, sometimes visible as opaque dark-colored smoke) has traditionally been of greater concern, as it presents different health concerns and is rarely produced in significant quantities by spark-ignition engines. These especially harmful particulate contaminants are at their peak when such engines are run without sufficient oxygen to fully combust the fuel; when a diesel engine runs at idle, enough oxygen is usually present to burn the fuel completely.^[16] (The oxygen requirement in non-idling engines is usually mitigated using turbocharging.^{[citation needed]}). From the particle emission standpoint, exhaust from diesel vehicles has been reported to be significantly more harmful than those from petrol vehicles.

Diesel exhausts, long known for their characteristic smells, changed significantly with the reduction of sulfur content of diesel fuel, and again when catalytic converters were introduced in exhaust systems.^{[not verified in body]} Even so, diesel exhausts continue to contain an array of inorganic and organic pollutants, in various classes, and in varying concentrations (see below), depending on fuel composition and engine running conditions.

Exhaust gas composition according to various sources

Diesel engine exhaust composition

	Average Diesel engine exhaust composition (Reif 2014)[17]	Average Diesel engine exhaust composition (Merker, Teichmann, 2014)[18]	Very first Diesel engine exhaust composition (Hartenstein, 1895)[19]	Diesel engine exhaust composition (Khair, Majewski, 2006)[20]	Diesel engine exhaust composition (various sources)
Species	Mass percentage	Volume percentage	Volume percentage	(Volume?) percentage
Nitrogen (N2)	75.2 %	72.1 %	-	~67 %	-
Oxygen (O2)	15 %	0.7 %	0.5 %	~9 %	-
Carbon dioxide (CO2)	7.1 %	12.3 %	12.5 %	~12 %	-
Water (H2O)	2.6 %	13.8 %	-	~11 %	-
Carbon monoxide (CO)	0.043 %	0.09 %	0.1	-	100–500 ppm[21]
Nitrogen oxide (NO x )	0.034 %	0.13 %	-	-	50–1000 ppm[22]
Hydrocarbons (HC)	0.005 %	0.09 %	-	-	-
Aldehyde	0.001 %	n/a	-	-	-
Particulate matter (Sulfate + solid substances)	0.008 %	0.0008 %	-	-	1–30 mg·m−3[23]

Chemical classes

The following are classes of chemical compounds that have been found in diesel exhaust.^[24]

Class of chemical contaminant	Note
antimony compounds[citation needed]	Toxicity similar to arsenic poisoning[25]
beryllium compounds	IARC Group 1 carcinogens
chromium compounds[26]	IARC Group 3 carcinogens
cobalt compounds
cyanide compounds[26]
dioxins[26] and dibenzofurans
manganese compounds[26]
mercury compounds[26]	IARC Group 3 carcinogens
nitrogen oxides[26]	5.6 ppm or 6500 μg/m³[1]
polycyclic organic matter, including polycyclic aromatic hydrocarbons (PAHs)[1][26]
selenium compounds
sulfur compounds[26]

Specific chemicals

The following are classes of specific chemicals that have been found in diesel exhaust.^{[26][verification needed][needs update][1][page needed][verification needed]}

Chemical contaminant	Note	Concentration, ppm
acetaldehyde	IARC Group 2B (possible) carcinogens
acrolein	IARC Group 3 carcinogens
aniline	IARC Group 3 carcinogens
arsenic	IARC Group 1 carcinogens, endocrine disruptor[citation needed]
benzene[1]	IARC Group 1 carcinogens
biphenyl	Mild toxicity[citation needed]
bis(2-ethylhexyl) phthalate	Endocrine disruptor[27][28][29][30]
1,3-Butadiene	IARC Group 2A carcinogens
cadmium	IARC Group 1 carcinogens, endocrine disruptor[citation needed]
chlorine	Byproduct of urea injection[citation needed]
chlorobenzene	"[L]ow to moderate" toxicity[31]
cresol§
dibutyl phthalate	Endocrine disruptor[citation needed]
1,8-dinitropyrene	Strongly carcinogenic[32][33]
ethylbenzene
formaldehyde	IARC Group 1 carcinogens
inorganic lead	Endocrine disruptor[citation needed]
methanol
methyl ethyl ketone
naphthalene	IARC Group 2B carcinogens
nickel	IARC Group 2B carcinogens
3-nitrobenzanthrone (3-NBA)	Strongly carcinogenic[32][34]	0.6-6.6[35]
4-nitrobiphenyl	Irritant, damages nerves/liver/kidneys[36]	2.2[37][38]
phenol
phosphorus
Pyrene[1]		3532–8002[37][39]
Benzo(e)pyrene		487–946[37][39]
Benzo(a)pyrene	IARC Group 1 carcinogen	208–558[37][39]
Fluoranthene[1]	IARC Group 3 carcinogens	3399–7321[37][39]
propionaldehyde
styrene	IARC Group 2B carcinogens
toluene	IARC Group 3 carcinogens
xylene§	IARC Group 3 carcinogens

^§Includes all regioisomers of this aromatic compound. See ortho-, meta-, and para-isomer descriptions at each compound's article.

Water vapor

Vehicle exhaust contains much water vapor. There has been research into ways that troops in deserts can recover drinkable water from their vehicles' exhaust gases.
^[40]

Regulation

Further information: Emission standard and Non-road diesel engine § Emission standards

To rapidly reduce particulate matter from heavy-duty diesel engines in California, the California Air Resources Board created the Carl Moyer Program to provide funding for upgrading engines ahead of emissions regulations.^[41] In 2008, the California Air Resources Board also implemented the 2008 California Statewide Truck and Bus Rule which requires all heavy-duty diesel trucks and buses, with a few exceptions, that operate in California to either retrofit or replace engines in order to reduce diesel particulate matter.^{[citation needed]} The US Mine Safety and Health Administration (MSHA) issued a health standard in January 2001 designed to reduce diesel exhaust exposure in underground metal and nonmetal mines; on September 7, 2005, MSHA published a notice in the Federal Register proposing to postpone the effective date from January 2006 until January 2011.^{[citation needed]}

Health concerns

General concerns

Emissions from diesel vehicles have been reported to be significantly more harmful than those from petrol vehicles.^{[42][better source needed]} Diesel combustion exhaust is a source of atmospheric soot and fine particles, which is a component of the air pollution implicated in human cancer,^[43][44] heart and lung damage,^[45] and mental functioning.^[46] Moreover, diesel exhaust contains contaminants listed as carcinogenic for humans by the IARC (part of the World Health Organization of the United Nations), as present in their List of IARC Group 1 carcinogens.^[7] Diesel exhaust pollution is thought^{[by whom?]} to account for around one quarter of the pollution in the air in previous decades,^[when?] and a high share of sickness caused by automotive pollution.^{[47][better source needed]}

Occupational health effects

Two diesel particulate matter monitors

Exposure to diesel exhaust and diesel particulate matter (DPM) is an occupational hazard to truckers, railroad workers and occupants of residential homes in vicinity of a rail yard, and miners using diesel-powered equipment in underground mines. Adverse health effects have also been observed in the general population at ambient atmospheric particle concentrations well below the concentrations in occupational settings.

In March 2012, U.S. government scientists showed that underground miners exposed to high levels of diesel fumes have a threefold increased risk for contracting lung cancer compared with those exposed to low levels. The $11.5 million Diesel Exhaust in Miners Study (DEMS) followed 12,315 miners, controlling for key carcinogens such as cigarette smoke, radon, and asbestos. This allowed scientists to isolate the effects of diesel fumes.^[48][49]

For over 10 years, concerns have been raised in the USA regarding children's exposure to DPM as they ride diesel-powered school buses to and from school.^[50] In 2013, the Environmental Protection Agency (EPA) established the Clean School Bus USA initiative in an effort to unite private and public organizations in curbing student exposures.^[51]

Concerns regarding particulates

Heavy truck, with visible particulate soot

Diesel particulate matter (DPM), sometimes also called diesel exhaust particles (DEP), is the particulate component of diesel exhaust, which includes diesel soot and aerosols such as ash particulates, metallic abrasion particles, sulfates, and silicates. When released into the atmosphere, DPM can take the form of individual particles or chain aggregates, with most in the invisible sub-micrometre range of 100 nanometers, also known as ultrafine particles (UFP) or PM0.1.

The main particulate fraction of diesel exhaust consists of fine particles. Because of their small size, inhaled particles may easily penetrate deep into the lungs.^[1] The polycyclic aromatic hydrocarbons (PAHs) in the exhaust stimulate nerves in the lungs, causing reflex coughing, wheezing and shortness of breath.^[52] The rough surfaces of these particles makes it easy for them to bind with other toxins in the environment, thus increasing the hazards of particle inhalation.^{[16][verification needed][1]}

A study of particulate matter (PM) emissions from transit buses running on ULSD and a mixture of biodiesel and conventional diesel (B20) was reported by Omidvarborna and coworkers, where they conclude PM emissions appeared lower in cases of mixed diesel/biodiesel use, where they were dependent on the engine model, cold and hot idle modes, and fuel type, and that heavy metals in PM emitted during hot idling were greater than those from cold idling; reasons for PM reduction in biodiesel emissions were suggested to result from the oxygenated structure of biodiesel fuel, as well as arising from changes in technology (including the use of a catalytic converter in this test system).^[53] Other studies concluded that while in certain specific cases (i.e. low loads, more saturated feedstocks, ...), NOx emissions can be lower than with diesel fuel, in most cases NOx emissions are higher, and the NOx emissions even go up as more biofuel is mixed in. Pure biodiesel (B100) even ends up having 10-30% more NOx emissions compared to regular diesel fuel.^[54]

Specific effects

Exposures have been linked with acute short-term symptoms such as headache, dizziness, light-headedness, nausea, coughing, difficult or labored breathing, tightness of chest, and irritation of the eyes and nose and throat.^[55] Long-term exposures can lead to chronic, more serious health problems such as cardiovascular disease, cardiopulmonary disease, and lung cancer.^[43][44][56]
Elemental carbon attributable to traffic was significantly associated with wheezing at age 1 and persistent wheezing at age 3 in the Cincinnati Childhood Allergy and Air Pollution Study birth cohort study.^[57]

The NERC-HPA funded Traffic Pollution and Health in London project at King's College London is currently^[when?] seeking to refine understanding of the health effects of traffic pollution.^[58] Ambient traffic-related air pollution was associated with decreased cognitive function in older men.^[46]

Mortality from diesel soot exposure in 2001 was at least 14,400 out of the German population of 82 million, according to the official report 2352 of the Umweltbundesamt Berlin (Federal Environmental Agency of Germany).^{[citation needed]}

The study of nanoparticles and nanotoxicology is in its infancy, and health effects from nanoparticles produced by all types of diesel engines are still being uncovered. It is clear, that diesel health detriments of fine particle emissions are severe and pervasive. Although one study found no significant evidence that short-term exposure to diesel exhaust results in adverse extrapulmonary effects, effects that are correlated with an increase in cardiovascular disease,^[59] a 2011 study in The Lancet concluded that traffic exposure is the single most serious preventable trigger of heart attack in the general public, as the cause of 7.4% of all attacks.^[45] It is impossible to tell how much of this effect is due to the stress of being in traffic and how much is due to exposure to exhaust.^{[citation needed]}

Since the study of the detrimental health effects of nanoparticles (nanotoxicology) is still in its infancy, and the nature and extent of negative health impacts from diesel exhaust continues to be discovered. It remains controversial, whether the public health impact of diesels is higher than that of petrol-fuelled vehicles.^[60]

Variation with engine conditions

The types and quantities of nanoparticles can vary according to operating temperatures and pressures, presence of an open flame, fundamental fuel type and fuel mixture, and even atmospheric mixtures. As such, the resulting types of nanoparticles from different engine technologies and even different fuels are not necessarily comparable. One study has shown that 95% of the volatile component of diesel nanoparticles is unburned lubricating oil.^[61] Long-term effects still need to be further clarified, as well as the effects on susceptible groups of people with cardiopulmonary diseases.

Diesel engines can produce black soot (or more specifically diesel particulate matter) from their exhaust. The black smoke consists of carbon compounds that have not burned because of local low temperatures where the fuel is not fully atomized. These local low temperatures occur at the cylinder walls, and at the surface of large droplets of fuel. At these areas where it is relatively cold, the mixture is rich (contrary to the overall mixture which is lean). The rich mixture has less air to burn and some of the fuel turns into a carbon deposit. Modern car engines use a diesel particulate filter (DPF) to capture carbon particles and then intermittently burn them using extra fuel injected directly into the filter. This prevents carbon buildup at the expense of wasting a small quantity of fuel.

The full load limit of a diesel engine in normal service is defined by the "black smoke limit", beyond which point the fuel cannot be completely burned. As the "black smoke limit" is still considerably lean of stoichiometric, it is possible to obtain more power by exceeding it, but the resultant inefficient combustion means that the extra power comes at the price of reduced combustion efficiency, high fuel consumption and dense clouds of smoke. This is only done in high performance applications where these disadvantages are of little concern.

When starting from cold, the engine's combustion efficiency is reduced because the cold engine block draws heat out of the cylinder in the compression stroke. The result is that fuel is not burned fully, resulting in blue and white smoke and lower power outputs until the engine has warmed. This is especially the case with indirect injection engines, which are less thermally efficient. With electronic injection, the timing and length of the injection sequence can be altered to compensate for this. Older engines with mechanical injection can have mechanical and hydraulic governor control to alter the timing, and multi-phase electrically controlled glow plugs, that stay on for a period after start-up to ensure clean combustion; the plugs are automatically switched to a lower power to prevent their burning out.

Ecological effects

Experiments in 2013 showed that diesel exhaust impaired bees' ability to detect the scent of oilseed rape flowers.^[62]

Remedies

General

With emissions standards tightening, diesel engines are having to become more efficient and have fewer pollutants in their exhaust.^{[citation needed]} For instance, light duty truck must now have NOx emissions less than 0.07 g/mile,^{[when?][citation needed]} and in the U.S., by 2010, NOx emissions must be less than 0.03 g/mile.^{[citation needed]} Moreover, in recent years the United States, Europe, and Japan have extended emissions control regulations from covering on-road vehicles to include farm vehicles and locomotives, marine vessels, and stationary generator applications.^[63]Changing to a different fuel (i.e. dimethyl ether, and other bioethers as diethyl ether^[64] ) tends to be a very effective means to reduce pollutants such as NOx and CO. When running on dimethyl ether (DME) for instance, particulate matter emissions are near-nonexistent, and the use of diesel particulate filters could even be omitted.^[65] Also, given that DME can be made from animal, food, and agricultural waste, it can even be carbon-neutral (unlike regular diesel). Mixing in bioether (or other fuels such as hydrogen)^[66][67] into conventional diesel also tends to have a beneficial effect on the pollutants that are emitted.
In addition to changing the fuel, US engineers have also come up with two other principles and distinct systems to all on-market products that meet the U.S. 2010 emissions criteria,^{[citation needed][needs update]}selective non-catalytic reduction (SNCR), and exhaust gas recirculation (EGR). Both are in the exhaust system of diesel engines, and are further designed to promote efficiency.^{[citation needed]}

Selective catalytic reduction

Selective catalytic reduction (SCR) injects a reductant such as ammonia or urea — the latter aqueous, where it is known as diesel exhaust fluid, DEF) — into the exhaust of a diesel engine to convert nitrogen oxides (NO_x) into gaseous nitrogen and water. SNCR systems have been prototyped that reduce 90% of the NO_x in the exhaust system, with commercialized systems being somewhat lower.^{[citation needed]} SCR systems do not necessarily need particulate matter (PM) filters; when SNCR and PM filters are combined, some engines have been shown to be 3-5% more fuel efficient.^{[citation needed]} A disadvantage of the SCR system, in addition to added upfront development cost (which can be offset by compliance and improved performance),^{[citation needed]} is the need to refill the reductant, the periodicity of which varies with the miles driven, load factors, and the hours used.^{[68][full citation needed][better source needed][third-party source needed]} The SNCR system is not as efficient at higher revolutions per minute (rpm).^{[citation needed]} SCR is being optimized to have higher efficiency with broader temperatures, to be more durable, and to meet other commercial needs.^[63]

Exhaust gas recirculation

Main article: Exhaust gas recirculation § In diesel engines

See also: Water injection (engine)

Exhaust gas recirculation (EGR), on diesel engines, can be used to achieve a richer fuel to air mixture and a lower peak combustion temperature. Both effects reduce NO_x emissions, but can negatively impact efficiency and the production of soot particles. The richer mix is achieved by displacing some of the intake air, but is still lean compared to petrol engines, which approach the stoichiometric ideal. The lower peak temperature is achieved by a heat exchanger that removes heat before re-entering the engine, and works due to the exhaust gases' higher specific heat capacity than air. With the greater soot production, EGR is often combined with a particulate matter (PM) filter in the exhaust.^{[69][full citation needed]} In turbocharged engines, EGR needs a controlled pressure differential across the exhaust manifold and intake manifold, which can be met by such engineering as use of a variable geometry turbocharger,^{[citation needed]} which has inlet guide vanes on the turbine to build exhaust backpressure in the exhaust manifold directing exhaust gas to the intake manifold.^[69] It also requires additional external piping and valving, and so requires additional maintenance.^{[citation needed][70]}

Combined systems

John Deere, the farm equipment manufacturer is implementing such a combined SCR-EGR design, in a 9-liter "inline 6" diesel engine that involves both system types, a PM filter and additional oxidation catalyst technologies.^{[71][better source needed][third-party source needed]} The combined system incorporates two turbochargers, the first on the exhaust manifold, with variable geometry and containing the EGR system; and a second a fixed geometry turbocharger. Recirculated exhaust gas and the compressed air from the turbochargers have separate coolers, and air merges before entering the intake manifold, and all subsystems are controlled by a central engine control unit that optimizes minimization of pollutants released in the exhaust gas.^[71]

Other remedies

A new technology being tested in 2016 has been created by Air Ink which collects carbon particles using a "Kaalink" cylindrical device that is retrofitted into a vehicle's exhaust system, after processing to remove heavy metals and carcinogens, the company plans to use the carbon to make ink.^[72]

Water recovery

There has been research into ways that troops in deserts can recover drinkable water from their vehicles' exhaust gases.
^{[73][74][75][76][77]}

See also

• Vehicle emissions control


• Carl Moyer Program


• National Emissions Standards for Hazardous Air Pollutants


• List of IARC Group 1 carcinogens


• List of IARC Group 2A carcinogens


• List of IARC Group 2B carcinogens


• List of IARC Group 3 carcinogens


• Volkswagen emissions violations


• 
  Rolling coal - intentional creation of excessive diesel exhaust

References and notes

1. 
   ^ ^abcdefghij Lippmann, Morton, ed. (2009). Environmental Toxicants (PDF). pp. 553, 555, 556, 562. doi:10.1002/9780470442890. ISBN 9780470442890. composition can vary markedly with fuel composition, engine type, operating conditions ... combustion of petroleum fuel produces primarily carbon dioxide, water, and nitrogen ... The health risks lie in the small, invisible or poorly visible particles ... carbon (EC) core of diesel soot ... serves as a nucleus for condensation of organic compounds from unburned or incompletely burned fuel ... it still appears that nitrated PAHs are the most predominant bacterial mutagens.mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
   


2. 
   ^ "IARC: DIESEL ENGINE EXHAUST CARCINOGENIC" (Press release). International Agency for Research on Cancer (IARC). June 12, 2012. Retrieved August 14, 2016. The scientific evidence was reviewed thoroughly by the Working Group and overall it was concluded that there was sufficient evidence in humans for the carcinogenicity of diesel exhaust. The Working Group found that diesel exhaust is a cause of lung cancer (sufficient evidence) and also noted a positive association (limited evidence) with an increased risk of bladder cancer
   


3. 
   ^ "Report on Carcinogens: Diesel Exhaust Particulates" (PDF). National Toxicology Program, Department of Health and Human Services. October 2, 2014. Exposure to diesel exhaust particulates is reasonably anticipated to be a human carcinogen, based on limited evidence of carcinogenicity from studies in humans and supporting evidence from studies in experimental animals and mechanistic studies.
   


4. 
   ^ "Diesel engine exhaust; CASRN N.A." (PDF). U.S. Environmental Protection Agency. 2003-02-28. Using U.S. EPA's revised draft 1999 Guidelines for Carcinogen Risk Assessment (U.S. EPA, 1999), diesel exhaust (DE) is likely to be carcinogenic to humans by inhalation from environmental exposures.
   


5. 
   ^ Silverman, Debra T.; Samanic, Claudine M.; Lubin, Jay H.; Blair, Aaron E.; Stewart, Patricia A.; Vermeulen, Roel; Coble, Joseph B.; Rothman, Nathaniel; Schleiff, Patricia L. (2012-06-06). "The Diesel Exhaust in Miners study: a nested case-control study of lung cancer and diesel exhaust". Journal of the National Cancer Institute. 104 (11): 855–868. doi:10.1093/jnci/djs034. ISSN 1460-2105. PMC 3369553. PMID 22393209.
   


6. 
   ^ Attfield, Michael D.; Schleiff, Patricia L.; Lubin, Jay H.; Blair, Aaron; Stewart, Patricia A.; Vermeulen, Roel; Coble, Joseph B.; Silverman, Debra T. (2012-06-06). "The Diesel Exhaust in Miners study: a cohort mortality study with emphasis on lung cancer". Journal of the National Cancer Institute. 104 (11): 869–883. doi:10.1093/jnci/djs035. ISSN 1460-2105. PMC 3373218. PMID 22393207.
   


7. 
   ^ ^ab IARC. "Diesel Engine Exhaust Carcinogenic" (Press release). International Agency for Research on Cancer (IARC). Retrieved June 12, 2012. After a week-long meeting of international experts, the International Agency for Research on Cancer (IARC), which is part of the World Health Organization (WHO), today classified diesel exhaust as probably carcinogenic to humans (Group 1), based on enough evidence that exposure is associated with an increased risk of lung cancer.
   


8. 
   ^ Scheepers, P. T.; Bos, R. P. (1992-01-01). "Combustion of diesel fuel from a toxicological perspective. I. Origin of incomplete combustion products". International Archives of Occupational and Environmental Health. 64 (3): 149–161. doi:10.1007/bf00380904. ISSN 0340-0131. PMID 1383162.
   


9. 
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10. 
    ^ Krivoshto, Irina N.; Richards, John R.; Albertson, Timothy E. & Derlet, Robert W. (January 2008). "The Toxicity of Diesel Exhaust: Implications for Primary Care". Medical Journal. 21 (1): 55–62. doi:10.3122/jabfm.2008.01.070139. PMID 18178703.
    


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    ^ Gajendra Babu, M.K.; Subramanian, K.A. (18 June 2013). Alternative Transportation Fuels: Utilisation in Combustion Engines. Book. CRC Press. p. 230. ISBN 9781439872819. Retrieved 24 October 2015.
    


12. 
    ^ Majewski, W. Addy (2012). "What Are Diesel Emissions". Ecopoint Inc. Retrieved 5 June 2015.
    ^{[third-party source needed]}
    


13. 
    ^ Fuller, Gary (Jul 8, 2012). "Diesel cars emit more nitrogen oxides than petrol cars". The Guardian. Retrieved 5 June 2015. New diesels produce similar nitrogen oxides to those bought 15 years ago. Typical modern diesel cars emit around 20 times more nitrogen oxides than petrol cars.
    


14. 
    ^ Lean, Geoffrey (Jul 19, 2013). "Why is killer diesel still poisoning our air?". The Telegraph. Retrieved 5 June 2015. Much of the problem is down to EU emission standards, which have long allowed diesel engines to emit much more nitrogen dioxide than petrol ones.
    


15. 
    ^ Carslaw D., Beevers; S., Westmoreland E.; Williams, M.; Tate, J.; Murrells, T.; Stedman, J.; Li, Y.; Grice, S.; Kent A & Tsagatakis, I. (2011). Trends in NOX and NO2 emissions and ambient measurements in the UK. London: Department for Environment, Food and Rural Affairs. However, vehicles registered from 2005–2010 emit similar or higher levels of NOx compared with vehicles before 1995. In this respect, NOx emissions from diesel cars have changed little over a period of about 20 years.
    


16. 
    ^ ^ab Omidvarbornaa, Hamid; Kumara, Ashok; Kim, Dong-Shik (2015). "Recent Studies on Soot Modeling for Diesel Combustion". Renewable and Sustainable Energy Reviews. 48: 635–647. doi:10.1016/j.rser.2015.04.019.
    


17. 
    ^ Konrad Reif (ed): Dieselmotor-Management im Überblick. 2nd edition. Springer Fachmedien, Wiesbaden 2014,
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18. 
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35. 
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36. 
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37. 
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38. 
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40. 
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41. 
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42. 
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44. 
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    "... [O]dds ratios and frequencies of each trigger were used to compute population-attributable fractions (PAFs), which estimate the proportion of cases that could be avoided if a risk factor were removed. PAFs depend not only on the risk factor strength at the individual level but also on its frequency in the community. ... [T]he exposure prevalence for triggers in the relevant control time window ranged from 0.04% for cocaine use to 100% for air pollution. ... Taking into account the OR and the prevalences of exposure, the highest PAF was estimated for traffic exposure (7.4%) ...

    
    


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47. 
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49. 
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51. 
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64. 
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65. 
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66. 
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67. 
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Further reading

• Department of Labor, Mine Safety and Health Administration. Diesel Particulate Matter Exposure of Underground Metal and Nonmetal Miners: Final Rule, January 19, 2001. Federal Register 66(13):5706.


• 
  Monforton, C (2006). "Weight of the Evidence or Wait for the Evidence? Protecting Underground Miners from Diesel Particulate Matter". American Journal of Public Health. 96 (2): 271–276. doi:10.2105/ajph.2005.064410. PMC 1470492. PMID 16380560. Archived from the original on 2011-05-25.
  


• 
  Steenland, K; Silverman, DT; Hornung, DW (1990). "Case control study of lung cancer and truck driving in the Teamsters union". American Journal of Public Health. 80 (6): 670–674. doi:10.2105/ajph.80.6.670. PMC 1404737. PMID 1693040.
  


• 
  Steenland, K; Silverman, DT; Zaebst, D (1992). "Exposure to diesel exhaust in the trucking industry and possible relationships with lung cancer". American Journal of Industrial Medicine. 21 (6): 887–890. doi:10.1002/ajim.4700210612.
  


• 
  Bruske-Holhfield, I; Mohner, M; Ahrens, W; et al. (1999). "Lung cancer risk in male workers occupationally exposed to diesel motor emissions in Germany". American Journal of Industrial Medicine. 36 (4): 405–414. doi:10.1002/(sici)1097-0274(199910)36:4<405::aid-ajim1>3.3.co;2-n.
  


• Wichmann, H.-E. Abschaetzung positiver gesundheitlicher Auswirkungen durch den Einsatz von Partikelfiltern bei Dieselfahrzeugen in Deutschland Umweltbundesamt Berlin 2003. Report 2352, especially page 32


• 
  Umweltbundesamt Berlin Future Diesel. Abgasgesetzgebung Pkw, leichte Nfz und Lkw – Fortschreibung der Grenzwerte bei Dieselfahrzeugen 2003. Report 2353, especially page 25

External links

• 
  Diesel Retrofit in Europe.


• NIOSH Mining Safety and Health Topic: Diesel Exhaust


• 
  Diesel Particulate Matter, a case study at www.defendingscience.org
  


• 
  Clean School Bus USA, EPA Initiative


• 
  Weight of the Evidence or Wait for the Evidence? Protecting Underground Miners from Diesel Particulate Matter Article by Celeste Monforton. American Journal of Public Health, February 2006.


• Diesel exhaust -- peer reviewed studies by Health Effects Institute


• U.S. Department of Labor Occupational Safety & Health Administration: Safety and Health Topics: Diesel Exhaust


• Partial List of Chemicals Associated with Diesel Exhaust


• Diesel Exhaust Particulates: Reasonably Anticipated to Be A Human Carcinogen


• 
  Impact of Fuel Metal Impurities on the Durability of a Light-Duty Diesel Aftetreatment System National Renewable Energy Laboratory
  


• Scientific Study of Harmful Effects of Diesel Exhaust: Acute Inflammatory Responses in the Airways and Peripheral Blood After Short-Term Exposure to Diesel Exhaust in Healthy Human Volunteers


• Diesel exhaust: what you need to know


• 
  Health Effects of Diesel Exhaust - fact sheet by Cal/EPA and American Lung Association

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