What is the difference between a smog check&a smog test?

Answer In California, the difference between a Smog Test and a Smog Check is where the inspection may occur. Drivers receiving Department of Motor Vehicle (DMV) paperwork should pay particular attention t... Read More »

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Vehicle smog CA to another state, smog legal?

Can't speak for all states but in most if the car is classified as an antique (25 years old or more) it is exempt from smog requirements. California is one of the few exceptions. Not sure what othe... Read More »

Where does smog come from?

Smog comes from a photochemical reaction in the atmosphere. Smog is generated through the mixture of sunlight with hydrocarbons and nitrogen oxides that typically come from excessive automobile exh... Read More »

What are smog checks?

A smog check measures the amount of emissions from your vehicle by attaching a device to the exhaust while revving your engine. The amount of pollutants brought into the air are then measured and c... Read More »

What makes up smog?

Smog is a mixture of nitrogen oxides, ozone, aldehydes, peroxyacetyl nitrate, particulates and hydrocarbons from fossil fuels. It is the brownish color of nitrogen dioxide which makes the smog vis... Read More »