But there's lot of indoor air pollution, too, even if it's not as obvious.
但是，虽然并不明显，但是室内也存在大量的空气污染。
Indoor air pollution
原声例句
科学60秒 听力 2016年10月合集
VOA Special 2014年12月合集
The World Health Organization warns that millions of people are dying every year from indoor air pollution.
世卫组织警告称每年有数百万人因室内空气污染而死亡。
高级口译听力第四版
Cooking and heating with such solid fuels on open fires or stoves without chimneys leads to indoor air pollution.
用此类固体燃料在明火或没有烟囱的开放炉灶上做饭、取暖会导致室内空气污染。
英语百科
Indoor air quality
（重定向自Indoor air pollution）
Indoor air quality (IAQ) is a term which refers to the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants. IAQ can be affected by gases (including carbon monoxide, radon, volatile organic compounds), particulates, microbial contaminants (mold, bacteria), or any mass or energy stressor that can induce adverse health conditions. Source control, filtration and the use of ventilation to dilute contaminants are the primary methods for improving indoor air quality in most buildings. Residential units can further improve indoor air quality by routine cleaning of carpets and area rugs.
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