Air quality is a priority to automakers, and thanks to their technological advancements, automakers are on track to virtually eliminate smog-forming emissions from passenger vehicles in the next decade -- even with more cars on our roads and people travelling more miles. In fact, ozone-forming emissions from autos are expected to approach negligible levels. Looking ahead, by 2030 passenger cars will contribute only about 1% of ozone emissions from all sources of smog. Clean cars are here to stay, and as more consumers buy new vehicles with advanced emissions control systems, we will progress even faster.

1. By 2025, smog-forming emissions of hydrocarbons and nitrogen oxides from passenger vehicles will have dropped 99.8% since emissions controls began.


2. To place these reductions in context, automakers have reduced ozone faster than other man-made sources. On-road vehicles are projected to reduce hydrocarbons by about 96% by 2030, compared to reductions of about 63% from all man-made U.S. sources.

Ozone Reductions


3. Due to the dramatic reduction in smog-forming emissions from motor vehicles over several decades, by 2017 on-road mobile sources will contribute just 6.5% of all ozone precursors, down from almost 30% in 1970.


Average contributions to U.S. smog-forming emissions


4. By 2030 more progress will occur, with motor vehicles expected to contribute only 3.3% of all smog-forming emissions.


Average contributions to U.S. smog-forming emissions


5. If only passenger vehicles are considered (not including medium and heavy trucks), their smog-forming emissions are even smaller. By 2030, passenger vehicles (cars and light trucks) are anticipated to contribute only 1.2% of all smog-forming emissions.


Average contributions to U.S. smog-forming emissions