Sulphur emissions from steel mills become acid rain.炼钢厂排放出的硫形成了酸雨。

Their aim is to reduce the toxic levels of vehicle exhaust emissions.他们的目标是降低汽车排放尾气的毒性。

governmental regulations relating to the use, storage, and emission of toxic or other hazardous substances关于有毒物质或其他有害物质的使用、储存和排放的政府法规

New York has adopted new stricter emission standards for cars.纽约对汽车执行了更严格的新排放标准。

Standards will relate to ambient air quality and vehicle emission levels.标准将涉及环境空气质量以及汽车排放水平。