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光化學煙霧

发布日期：2023-02-16 13:57:46 作者：揚塵檢測儀來源：揚塵監測系統浏覽量：1409

光化學煙霧

工業革命改變了人類的生活，但是卻也埋下了隱患。人們也是經曆了一系列的事故之後才明白經濟發展不應以犧牲環境爲代價。但是可惜的是，早發展起來的西方國家無不都走了“先發展後治理”的老路子。

光化學煙霧最早发现于20世纪的美国

光化學煙霧是环境被污染后的灾难，本身是浅蓝色的烟雾。20世纪40年代首次在美国露面，当时一到夏季和早秋的大晴天，洛杉矶就会被蓝色的盐雾笼罩。当地的许多居民都出现眼睛刺痛、头痛、呼吸困难的症状。

据悉，美国洛杉矶的光化學煙霧事件从1940年持续到1960 年，这是世界上著名的公害事件之一。

位于美国西南海岸的洛杉矶得益于优越的地理位置，上世纪是一个商业、旅游业都很发达的港口城市，第一个“迪士尼乐园”都建立在了这里。城市的繁荣使得洛杉矶的人口急剧增加，那时候汽车已经面世。据说，洛杉矶在20 世纪 40 年代就有了250 万辆汽车，每天大约消耗1100 吨汽油，排放1000 多吨碳氢化合物，300 多吨氮氧化物，700 多吨一氧化碳（CO）。那时候车辆可没有减排的意识。

除了汽車尾氣，還有煉油廠、供油站等工業廢氣，洛杉矶的大氣受到了嚴重的汙染。

洛杉矶三面环山，大气污染物不容易扩散，而且经常受到逆温的影响，使得污染物更容易被聚集。这些污染物在紫外线的照射下，吸收能量，形成新的物质。这种化学反应就是光化学反应，其产物是具有毒性的光化學煙霧。

光化學煙霧不仅会刺激人眼睛，还会刺激咽喉，影响孕妇身体健康。图片来自：freeimages

光化學煙霧

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