What Is an Emissions Test, And Do I Need One?
https://www.capitalone.com:443/cars/learn/managing-your-money-wisely/what-is-an-emissions-test-and-do-i-need-one/1839
WebOct 24, 2022 · In the simplest terms, a state emissions test detects the amount of atmospheric pollution produced by an automobile while the engine is running, using sensors attached to its exhaust system. These pollutants can include carbon monoxide, oxygen, hydrocarbons, and nitrogen oxide.
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