求翻译：1955年8-9月, 又在洛杉矶发生光化学烟雾事件, 造成400老人死亡, 在该地的250万辆汽车,日排1000多吨碳氢化合物石油烃废气、一氧化碳和氧化氮,铅烟进入大气与空气中其他化学成份反应产生浅蓝色烟雾, 由于地势使之长期滞留造成污染。是什么意思？

August-September 1955, in Los Angeles photochemical smog event, 400 elderly people were killed in the land of 2.5 million vehicles, the daily discharge of over 1000 tons of hydrocarbons, petroleum hydrocarbons in exhaust gas, carbon monoxide and nitrogen oxides, lead smoke into the atmosphere light

In 1955, 8-9, in Los Angeles smog, causing 400 deaths in the elderly with 2.5 million vehicles, more than 1000 tons on hydrocarbon emissions from petroleum hydrocarbon emissions, carbon dioxide and nitrogen oxides, lead fumes into the atmosphere in the air with other chemical elements that produces

In 1955 8- in September, also has the photochemical smog event in Los Angeles, creates 400 old people to die, in this place 2,500,000 automobiles, the date platoon more than 1000 ton hydrocarbon petroleum hydrocarbon waste gas, the carbon monoxide and the nitrogen oxide, the lead smoke enters in the

1955-September, photochemical smog incidents in Los Angeles, causing 400 deaths for the elderly, the 2.5 million vehicles, today-more than 1000 tonnes of hydrocarbon emissions of hydrocarbons, carbon monoxide and nitrogen oxide, lead and smoke into the atmosphere and other chemical reactions produce

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