Smog, formed mainly above urban centers, is composed mainly of tropospheric ozone (O3); primary particulate matter such as pollen and dust; and secondary particulate matter such as sulphur oxides, volatile organic compounds (VOCs), nitrogen oxides (NOx) and ammonia gas. The severity of smog in an urban area is usually assessed by measuring ground-level ozone.
The most common cause of smog is the interaction of nitrogen oxides (or NOx) and particulate matter, sulfur dioxide and Volatile Organic Compounds.
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