造成9月9日夜间20：00～23：00一次污染物NO、CO和SO_2浓度急剧升高的原因是由于夜间稳定情况下，大气的垂直扩散减弱，污染物在底层积累造成的。
The cause for increasing of NO, CO and SO_2 concentration during 20: 00 ~ 23: 00 on September. 9 of 2001 is due to weak vertical diffuse and pollutants accumulated at low atmosphere in the night.
我们的皮肤在不停地剥落——每个人每两到四周就会更换一次表层皮肤——而所有那些脱落的皮肤可以帮助减少室内环境中的某些污染物含量。
We shed skin constantly — each of us replacing our outer layer of skin every two to four weeks — and all of those skin flakes may help reduce levels of certain pollutants in indoor environments.
目前，污染物测量是在一个城市的多个不同地点进行测量的，然后数据会合计成一个数字(空气质量指数)最后在网站上每天发布一次。
Currently, pollutants are measured at different stations in a city and that data is aggregated to a single number (the air quality index) and published once a day on a website.
汽车制造商对该法律提出质疑，部分根据是二氧化碳不属空气污染物——最高法院这一次完全否定了这种说法。
Carmakers have challenged the law, in part on the ground that CO2 was not an air pollutant-a notion the Supreme Court has now comprehensively quashed.
这种侦察特点可应用于任何植物，甚至可以一次性侦查出多种不同污染物——这些改变也可以从卫星图像中观测到。
The detection traits could be used in any plant and could detect multiple pollutants at once - changes that can also be detected by satellite.
这种侦察特点可应用于任何植物，甚至可以一次性侦查出多种不同污染物——这些改变也可以从卫星图像中观测到。
The detection traits could be used in any plant and could detect multiple pollutants at once - changes that can also be detected by satellite.
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