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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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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Cost for operation ventilation, operation safety, smog exhaust during a fire and its control and other key problems are well addressed.

在满足通风要求的基础上，重点研究了通风运营成本及运营安全、火灾排烟及火灾通风控制等关键问题。

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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