smog pretest
Smog Inspections - California DMV - CA.gov
Smog inspections are required when you register or renew registration for a vehicle in California, but there are some exceptions.
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Peroxyacetyl nitrate - Wikipedia
It is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas.
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What Causes Smog? - Caltech Science Exchange
Smog is mainly made of ground-level ozone and particulate matter. Here, Caltech scientists explain the smog formation process.
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