保护人们免受烟草烟雾危害。
环保署一直在治理汽车废气，力图控制大城市的烟雾危害。
The EPA has been cracking down on auto emissions in an attempt to curb the smog in major cities.
2008年，受到保护免遭二手烟雾危害的人数增加了74%，由2007年的2.08亿增加到3.62亿。
In 2008, the number of people protected from second-hand smoke increased by 74% to 362 million from 208 million in 2007.
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