Smog "and that air pollution is a major north. A product of the combustion process, combustion or incomplete. The source of air pollutants are embedded with tiny dust particles that, when inhaled, can not drive out pollutants, groups of species, most organic compounds are called. Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons), which contains not less than ten members of the carcinogenic substance, and almost all remain in the environment for a long time does not decompose easily.
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