Motorized vehicles are the #1 single largest source of air pollution.

Our engines and the fuels used to power them release numerous pollutants into the air through combustion and fuel evaporation. Each pollutant has serious effects on human health and the environment. (click on each pollutant to learn more).

• Acetaldehyde
• Acrolein
• Air Toxics
• Carbon Monoxide
• Chloroform
• Ethylene Dibromide
• Formaldehyde
• Nitrogen Oxides
• Ozone
• Particulate Matter
• Diesel Particulate Matter
• Sulfur Dioxide
• Toluene