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Air Quality Program

Diesel Exhaust

Air monitoring

Ecology has identified diesel exhaust as the air pollutant most harmful to public health in Washington. 70 percent of the cancer risk from airborne pollutants is from diesel exhaust. It puts healthy people at risk for respiratory disease and worsens the symptoms of people with health problems such as asthma, heart disease, and lung disease. More than four million people in Washington live or work close to highways and other major roads where they are likely to be exposed to diesel exhaust.

How is Ecology reducing diesel emissions?

Ecology is reducing diesel emissions by providing help to fleet managers to reduce idling, use cleaner fuels, install equipment to clean up diesel exhaust (called “exhaust retrofits”), and replace older engines with newer, cleaner ones.

The links below give more information about diesel exhaust and efforts to reduce diesel emissions.

Reducing Idling:

School bus information:

Cleaner diesel fuel

As of 2006, almost all petroleum-based diesel fuel available in the U.S. is ultra low sulfur diesel (ULSD). Burning ULSD substantially lowers emissions of particulate matter from diesel engines.

What are others doing to reduce diesel exhaust emissions?

Here are some examples from programs across the country: