(2) Oxidation type (Los Angeles type): pollutants come from automobile exhaust, oil fired boiler and petrochemical industry. The main primary pollutants are co, NOx and hydrocarbons. These air pollutants can cause photochemical reaction under sunlight, and form secondary pollutants, such as ozone, aldehydes, ketones, peroxyacetyl nitrates and other substances with strong oxidation, which can cause strong irritation to human eyes and other mucous membranes [1].<br>
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