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Air Quality Program



Vehicles are one of the main sources of air pollution in Washington. They cause pollution that triggers asthma and is linked to other health problems, including cancer and heart attacks. More than a third of Washington's residents are in an age group that is at risk for health problems from this pollution or have at least one medical condition that is made worse by it.

In addition, vehicles, along with other transportation, produce nearly half of the greenhouse gas emissions in our state. Greenhouse gases cause climate change. Effects of climate change in Washington include reduced snow pack, low summer stream flows, more winter flooding, increased coastal erosion, reduced water supplies for people and agriculture, and further loss of salmon habitat.

Clean cars

The Clean Car Law aims to reduce air pollution and greenhouse gases from cars and trucks. New vehicles that do not meet these clean car standards cannot be registered, licensed, rented, or sold for use in Washington.

Diesel exhaust

Diesel exhaust is one of the most harmful air pollutants. Ecology is working to reduce diesel emissions by providing assistance to fleet managers.

Emission testing

Find out more about Washington State's Vehicle Emission Check Program

Engine idling and air pollution

Read about air quality and health effects of motor vehicle idling, and how to reduce your vehicle's emissions.

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