Coal itself is a heavy pollutant.
煤本身就是一种严重的污染物。
The result shows that the peak of pollutant concentration is ahead of or synchronous with that of runoff, and heavy pollution occurs in initial period of storm runoff.
结果表明：污染物浓度的峰值一般提前或同步于径流量的峰值，初期径流污染较重；
Heavy metal is a common type of pollutant during accidental pollutions. In recent years, the frequency and intensity of accidental heavy metal pollution events tends to increase in China.
重金属是突发污染事件中比较常见的污染物，近年来我国突发重金属污染事件发生强度和频率的趋势增大。
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