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Diesel Emissions Reduction


Diesel engine emissions is a hot topic these days but for many people its not a big deal. It should be. It is no secret that engine emissions have had an effect on our world but for many of us, we go about our lives without giving it a second thought. Gasoline engine emissions have been drastically reduced and strictly governed for decades and we are now seeing similar changes and legislation reducing diesel engine emissions as well. Since 1991, on highway diesel engine manufacturers have had to meet incremental reductions for emissions levels, most notably particulate matter (PM) that pollutes the air and oxides of nitrogen (NOx) which are considered greenhouse gasses. Hydrocarbons (HC) and carbon monoxide (CO) are also regulated emissions along with visible smoke. The chart to the right shows the levels of allowable PM and NOx emissions and the dates by which they must be met for an engine to be certified for sale and use. The chart depicts the drastic reduction quite clearly. Gone are the days of trucks belching black smoke as newer trucks and machinery hit the highways and industry. This is what all the talk is about. This is why the new emissions reduction systems are being developed and are now being used on today's on-highway, industrial and off road diesel engines.

So why is all this so important?

After a decade long study, the Environmental Protection Agency has directly attributed lung cancer and other respiratory illnesses to long-term exposure to the toxic and harmful chemicals found in diesel exhaust fumes. It is not so much the hydrocarbon particles themselves that pose the major threat as it is the many chemicals that are attached to the particles that are known to threaten human health. For those of us in the automotive and transportation industries, our chances of being repeatedly exposed to elevated exhaust emissions and particulate matter increases. As a result, we risk the increased potential for disease, illness, lost productivity and higher health care costs therefore it is not only important to think about the environment but the people around you including yourself. Please take the time to observe safe working habits and learn how to keep your workplace safe. Effective exhaust entrapment systems and ventilation will help keep the air you breathe clean, safe and in compliance with the law.

Should I really be concerned?

Does this mean we should run for the hills or put on an oxygen mask anytime a diesel powered vehicle comes near? No and in fact, you need to be aware that diesel engine emissions are only a part of the air pollution problems we face. Other sources include gasoline engines, coal and oil burning industries, forest fires, volcanoes and even naturally occurring dust and dirt. The intention of this article is to bring awareness to the fact that diesel engine emissions are a factor in human health and the environment. As we look to the future, further research and studies will show what impact these emissions have had and how much. The changes in regulations forcing the production and use of diesel engines that employ after treatment devices and emissions reduction systems are only now making a big impact due to the cost of owning them and maintaining them. As more and more emissions compliant diesel engines are put into service and old ones are put to rest or are retro-fitted with after treatment systems, the true impact of these emissions may become more evident, though experts believe the full impact may not be realized until the year 2030, two full decades after the 2010 diesel emission levels are met.

Let's take a look at some important facts and information:


Chemicals known to be found in diesel exhaust

Diesel exhaust contains 41 chemicals or more that the State of California has identified as toxic air contaminants. The health risks of air toxins vary from pollutant to pollutant, but are all serious. This is only a partial listing of the chemicals and compounds that may be found in the emissions from any diesel engine. Most are known to be toxic and cause cancer. This list was compiled from several sources and is believed to be accurate.

  • Carbon Dioxide
  • Nitrogen Dioxide
  • Hydrogen Sulfide
  • Carbon Monoxide
  • Sulfur Dioxide
  • Acetaldehyde
  • Inorganic lead
  • Manganese Compounds
  • Aniline
  • Chlorine
  • Nickel
  • Biphenyl
  • 4-nitro biphenyl
  • Bis{2-ethylhexyl]phthalate
  • Phenol
  • 1,3-butakiene
  • Phosphorus
  • Cadmium
  • Acrolein
  • Benzene
  • Benzofuran
  • Nitric oxides
  • Polynuclear aromatic hydrocarbon
  • Acrolem
  • Mercury compounds
  • Antimony compounds
  • Methanol
  • Chlorobenzene
  • Arsenic
  • methyl
  • Ethyl
  • Ketone
  • Naphthalene
  • Beryllium compounds
  • Polycyclic organic matter
  • Formaldehyde
  • P-xylenes
  • M-xylenes
  • Dibenzofurans
  • Dioxins
  • O-xylenes
  • Dibutylphthalate
  • Isomers and mixtures
  • Xylene
  • Cyanide compounds
  • Toluene
  • Isomers
  • Creosol
  • Styrene
  • Cobalt compounds
  • Selenium compounds
  • Chromium compounds


Health Impact of Diesel Particulate Matter:

Most particulate matter emitted by diesel engines is small enough to evade the body's defenses and lodge deep in the lungs. Particulate matter air pollution is associated with increases in mortality, especially in people older than 65 years old who have existing cardiopulmonary diseases and in infants and children with developing lungs. It is also associated with health problems including aggravation of asthma, especially in children, and other chronic lung diseases, impacts on lung function, and increased susceptibility to infectious illnesses. Your severity of exposure will vary based on where you live, commute and work. Here are some of the risks of exposure:

Short-Term Effects
  • Irritation of eyes, nose and throat.
  • Inflammation of lung tissue
  • Difficulty breathing
  • Asthma attacks
  • Coughing
  • Wheezing
  • Dizziness
  • Drowsiness
  • Nausea
  • Vomiting
  • Headache
Long-Term Effects
  • Asthma
  • Emphysema
  • Bronchitis
  • Persistent cough
  • Cancer
  • Hypertension
  • Heart disease
  • Stroke
  • Infections and blood disorders
  • Premature births
  • Inhibited growth of lung tissue in children
  • Premature death


Environmental Impact of Diesel Emissions:

Diesel engines and vehicles emit pollutants like particulate matter (PM), sulfur oxides (Sox), toxic compounds, such as formaldehyde, and ozone precursors, such as NOx and VOCs. Ground level ozone pollution causes crop and forestry losses. Particulate matter causes damage to materials and soils, commonly used building materials and culturally important items such as statues and works of art. NOx, Sox and particulate matter contribute to visibility impairment. NOx emissions contribute to the acidification, nitrification and eutrophication of water bodies. To put it into simple terms, diesel emissions help make everything dirty.

  • Contributes to smog
  • Contributes to ground-level ozone
  • Contributes to water and soil pollution
  • Contributes to global warming
  • Reduces visibility
  • Absorbs sunlight causing global climate changes
  • May affect local climate
  • Damages buildings, statues and artwork


Take action to avoid exposure whenever and wherever possible.

Be pro active by keeping the air you breathe in the workplace clean and reasonably free from exhaust fumes. Know and understand the risks and dangers these fumes present and what you can do to reduce or eliminate them and encourage others to do the same. Protecting your lungs is no less important than your eyes with safety glasses and your skin from chemicals with gloves.

  • You have the right to work in a safe, healthy environment. It's the law!
    Check your local, state and federal regulations and guidelines for health and safety.

  • Work environments should have adequate ventilation. Operating vehicles indoors requires the use
    of exhaust entrapment systems like exhaust hoses connected to vehicle tail pipes. The use of vents
    or open doors alone is not enough but should be used in conjunction with exhaust hoses and hoods.

  • Ask your employer for information on the hazards associated with diesel fumes, read it, make sure you
    understand it and if not, seek clarification.

  • Use all available ventilation devices and controls available to you, know how to use them and be able to
    detect any inoperative equipment.

  • Report any broken or ineffective equipment to your employer such as poor extraction fans, leaking or
    poor fitting hoses.

  • Understand and recognize the symptoms of over exposure: light-headedness or dizziness, vomiting,
    coughing, sore throat, burning eyes. Know what to do: move the individual to fresh air and
    seek medical attention is symptoms are severe.

  • Take actions to reduce emissions from the start. Turn off engines when not in use. Discourage idling
    and unnecessary operation of vehicles and machinery especially indoors.

  • Use emissions reducing systems like catalysts, particulate traps and low sulfur fuels and lubricants.
    Maintain vehicles and equipment and keep them running properly.

  • Checking for the presence of soot on the walls or on other surfaces in your workplace is a useful
    indicator that diesel fumes are not being adequately controlled.



This article is only to provide information. It is hoped that it helps technicians in identifying possible causes and assist in the quick diagnosis of the identified concern. This is not intended to replace any official instructions, authorization or documentation of any Ford Motor Company Engineers, service manual, TSB, Service Message or recall. It is also hoped that this information will help us better understand what we do, why we do it and how to do it better.
 FDDTS