臭氧通常存在于距离地面30公里左右的高层大气中,它能有效阻挡紫外线,保护人类健康。 所谓的臭氧污染永远和光化学烟雾分不开,日常所说的臭氧污染其实就是指的光化学烟雾。
一氧化碳也是产生臭氧污染和城市雾霭的化学物质之一。
Carbon monoxide is also one of the chemicals that create ozone pollution and urban smog.
臭氧污染毁坏农作物,它由机动车尾气与日光反应造成。
Ozone air pollution damages crops and is created not just by automobile emissions reacting with sunlight.
据《中国日报》报道,夏季臭氧污染已经成为全国性问题。
Summer ozone pollution is becoming a problem nationwide, said China Daily.
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