因此，这项研究的作者说，加紧对长期空气微粒污染的限制是必需的。

As a consequence, the study authors say that tighter restrictions on long-term exposure to fine particulate pollution are needed.

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这座城市的沙尘和微粒污染指数达到300以上，这意味着人们必须待在家里。

Desert dust and particulate matter in the city had been known to force the pollution index into warning territory, above 300, which means people should stay indoors.

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环保署选中2006年底选中该镇，当地两年来微粒污染(专家称之为“浮沉”)超过了排放标准。

The EPA tagged the county at the end of 2006, after pollution from particulates - known to experts as "fugitive dust" - exceeded the emissions standard for two years running.

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