... atmospheric[al] pollution 大气污染 background pollution 背景污染,本底污染 chronic pollution 慢性污染,长期污染 ...
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阿拉木图的山地曾经是城市的美丽背景，现在已经成了积聚空气污染的帮凶。
The city’s mountains, while providing a beautiful backdrop to the old capital, helped to trap pollution.
由手铅、砷污染元素呈偏态分布，故采用偏态分布中的中位数法作了铅、砷自然背景值及含量的统计。
As lead and arsenic pollution element are skew distribution, statistics of a natural background value and a content of lead and arsenic are worked out using median method of skew distribution.
根据对其黑臭的背景分析，发现水体有机污染较严重，河道富营养化趋势较为明显。
Based on the analysis of the malodorous black water bodies' background, the serious organic pollution of rivers and obvious tendency to eutrophication were demonstrated.
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