The results showed that, in addition to a high residue level of pollutant in a few tea gardens, the residue of most pollutant in the soil of these Oolong tea gardens was low.

结果表明，除少数茶园土壤个别污染物残留值偏高外，绝大多数茶园土壤污染物残留值均较低。

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Taking Sui-Chang Gold Mine for an example, this paper made a systematic description of the treatment of high cyanide-bearing waste water in accordance with the criterion of low pollutant emission.

本文以遂昌金矿含氰污水处理为例，系统地阐述了低排放高含氰污水的处理。

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While the ozone layer in the upper atmosphere plays an important role in limiting harmful ultraviolet light reaching the Earth's surface, low-level ozone is a pollutant that is harmful, causing respiratory problems in animals as well as well-documented cases in humans.

BBC: Invasive plant 'increases ozone pollution'