Air particulate matter pollution has become one of the most protruding problems.

颗粒物已成为环境空气污染最突出的问题之一。

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Results For each health outcome from morbidity to mortality changes, the relative risks were estimated when the concentration of air particulate matter increased some certain units.

结果建立了从发病到死亡各个健康效应终点上，大气颗粒物浓度每升高一定单位，人群不良健康效应发生的相对危险度。

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The Clean Air Act mandates the EPA to regulate harmful pollutants such as particulate matter and ozone.

《清洁空气法》授权美国环保局监管有害污染物，如微粒物质和臭氧。

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The letters H-E-P-A represent the words High Efficiency Particulate Air.

VOA: special.2009.07.14

WMO scientists assess and monitor air pollutants such as ground-level ozone,smog, particulate matter, sulfur dioxide and carbon monoxide.

VOA: standard.2009.03.23

Plastic mattress covers help keep dander out of beds, and room air cleaners equipped with high efficiency particulate air (HEPA) filters can remove dander from the air.

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The study was actually conducted in and reported on air pollution in Boston, but it pointed out that air quality levels even below current standards set by the Environmental Protection Agency still pose risks to people who breathe particulate air pollution.

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These measurements were then correlated with data on fine particulate air pollution.

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