The Clean Air Act of 1970 established a federal law in the United States that requires automakers to manufacture vehicles that produce fewer emissions. Before that, California enacted the first standards for tailpipe emissions in 1966. Limiting the amount of pollutants coming from a vehicle not only helps protect the environment, but it also protects public health. Smog checks and emissions tests commonly aim to cutdown on chemicals such as carbon monoxide, hydrocarbons, nitrogen oxides, and sulfur dioxide in
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