雅洛德说，对这种资料进行分析，让科学家得以更好地预测大气中有害污染物质的分布。
Jarraud says an analysis of this data enables scientists to better forecast the distribution of potentially harmful pollutants in the atmosphere.
但公司会把发现在某些种类的鱼中有对人体有害的污染物质告诉你吗？
But could they also expose you to the harmful pollutants found in some species of fish?
交通污染物质中往往含有更多的金属物质，可能在肺部产生有害的自由基。
Traffic pollution tends to contain more metals, which react to produce damaging free radicals in the lungs.
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