Clean Car Progress

5 measures of clean car progress

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 have reduced their emissions. 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.


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


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