以下是美国肺脏协会（American Lung Association）《2011年空气质量报告》（State of the Air report）统计出来的20大全年颗粒物污染最严重的大都市统计区。其中颗粒物包括烟尘等空气传播的毒素。
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state of the air report
空中状况报告
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The group's recent "State of the Air" report said Pittsburgh has the worst short-term fine particle pollution in the country.
VOA: special.2009.07.13
The American Lung Association (ALA) just released its annual State of the Air report.
FORBES: List: America's Most Polluted Cities
Boston did not even rank in the worst 25 metropolitan areas in the State of the Air report.
FORBES: Los Angeles Pollution From Car Exhaust Is Down 98%
The State of the Air report also ranked the Los Angeles-Long Beach- Riverside area as having the third-highest level of annual particle pollution in the nation and the fourth-highest level of short-term particle pollution.
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