Before you go outside to play always check the pollution index.
那你在出去玩之前，一定要经常检查空气污染指数。
Each pollution index can reach the air environment quality level-2 standard (GB3095 -1996).
各污染指标可满足环境空气质量(GB3095—1996)中二级标准。
Atmosphere vitriol velocity is an important index of Air pollution.
大气硫酸盐化速率是反应大气污染的重要指标。
Atmosphere vitriol velocity is an important index of Air pollution.
大气硫酸盐化速率是反应大气污染的重要指标。
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