photochemical smog
This sort of smog is mainly formed by the action of sunlight to the tail gases.
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characte pollutants came from automotive or mobile tail r
gas , through photochemical action, these gases become oxidizimg smog.
characte r the meteorologic conditions are high air tempreture, sunny days, strong ultraviolet rays. These occurred daytime in summer and autumn season.
characte r there are always crowded motor vehicle, forest of skyscraper, and poor ventilation of street in big cities.
characte symptom of victim are mainly eye red and swollen, r shedding tears, having a sore throat, asthma, cough, chest tightness, headache, skin flush ,heart functional disorder, lung functional failure, people those had heart diseases and pulmonary tuberculosis suffered seriously.