Co2 is not a pollutant .

二氧化碳并不是污染物。

This cut pollutant output by an estimated 350 tons last year .

去年，这项措施减少了约350吨污染物。

Iron in water is normally regarded a pollutant .

水中的铁原子通常被认为是一种污染源。

The environmental protection agency has classified perc as a toxic air pollutant and potential human carcinogen .

美国环境保护署（environmentalprotectionagency）将全氯乙烯归为空气污染物及潜在致癌物。

Kilroy can flag where the pollutant enters , determine its direction , and track it in its network downstream .

“吉劳埃”可以标示出污染物质进入地点、渗入方向并且在其下游网络中追踪污染物踪迹。