The Clean Air Act gave California the authority to issue tough pollution standards for vehicles, with EPA approval. The Trump administration is now trying to stop it.
Articles on Catalytic converters
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New catalytic converters can remove toxic chemicals from the exhaust fumes of combustion-engine cars.
Leaving your car running will marginally increase CO2 emissions, but it may massively reduce exposure to the toxic gases and particulates that are shortening thousands of lives.
