Cars & Trucks
The millions of cars, trucks and motorcycles operating on California's roadways each day are the single greatest source of smog-forming emissions in the state, and a top contributor to climate-changing gases. Keeping these cars and trucks well maintained and in good working order is a key part of the state’s pollution control program. Smog Checks and emissions equipment maintenance requirements help to keep pollution from cars and trucks down even as the number of motor vehicles - and the miles people drive them each day - continues to grow.
Whats under the hood is important to air quality. To ensure clean vehicles stay that way, owners are required to maintain emission control systems and only use parts that have been proven to not to increase emissions.