Also the attentions in application of CO2 fire system, new fire extinguishing agent FM-200 and smog control are presented.

并介绍CO2气体灭火系统，新型灭火剂FM - 200和烟烙尽在应用中应注意的一些问题。

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Pollution control measures are either not strict or nonexistent, leading to choking clouds of smog.

污染控制措施要么不严格要么不存在，导致了令人窒息的雾霾。

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Men in suits watch an experimental smog-control device on a smokestack in 1948.

1948年，这些西装笔挺的人们正在观看一台利用烟囱调节烟雾的实验性设备。

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The EPA last year issued the first-ever standards to control smog- and soot-forming gases from gas wells site, and updated existing rules to reduce cancer-causing pollution, such as benzene, from other equipment.

NPR: Report: Flaws In EPA Drilling Pollution Data