Background Material: Health Effects of Diesel Exhaust

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This page reviewed April 15, 2008.

Diesel engines emit a complex mixture of air pollutants, composed of gaseous and solid material. The visible emissions in diesel exhaust are known as particulate matter or PM. In 1998, California identified diesel exhaust particulate matter (PM) as a toxic air contaminant based on its potential to cause cancer, premature death, and other health problems. Diesel engines also contribute to California's fine particulate matter (PM2.5) air quality problems. Those most vulnerable are children whose lungs are still developing and the elderly who may have other serious health problems. Based on year 2000 emissions in California, diesel PM contributes each year to 2,000 premature deaths and thousands of hospital admissions, asthma attacks and other respiratory symptoms, and lost workdays. Overall, diesel engine emissions are responsible for the majority of California's known cancer risk from outdoor air pollutants. In addition, diesel soot causes visibility reduction and is a potent global warmer. The document describing Diesel Exhaust as a Toxic Air Contaminant is listed on this page.

Health Effects Fact Sheets

Below are two fact sheets developed by the ARB, which discuss the health effects of diesel exhaust. They include a two-page summary of the health effects and a longer discussion with references of diesel exhaust health effects.

Summary Fact Sheet

Diesel Health Effects Fact Sheet

For more information, please contact Dr. Linda Smith at lsmith@arb.ca.gov or (916) 327-8225.

Diesel Research Activities
Research Activities