A lack of wind or rain over the past week hasn't helped improve air quality.

上周缺少风雨的天气并没有对空气质量提高起到帮助作用。

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This will help improve air quality and efficient functioning of your heating system.

它可以提高空气的质量和暖气系统的功效。

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It will also provide excellent insulation, improve air quality, and require very little maintenance.

它还将提供优良的绝缘性，改善空气质量，并且仅需要极少的维护。

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A spokeswoman for the mayor's office, Joanna Dovan,says the Pittsburgh area has been working to improve its air quality.

VOA: special.2009.07.13

Planting trees around poultry farms can improve air and water quality and relations with neighbors.

VOA: special.2009.09.08

Other questions were on subjects including plans to improve air quality, the extent of drought, and promoting food exports.

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They say it is the unfortunate but unintended consequence of what have otherwise been very successful efforts to improve air quality.

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It is also claimed that the road will ease congestion and improve air quality on the busy A259 at Glyne Gap.

BBC: Tree protester