Poor air quality can also contribute to illness.

糟糕的空气质量也会导致生病。

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Smoke from fires can contribute to poor air quality far from the fire itself.

即使在距离火灾地点很远的地区，火灾烟尘也能使其空气质量下降。

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Last week, Beijing issued its first ever red alert because of poor air quality, closing schools and restricting traffic.

上周，北京发布了雾霾红色预警，致使多所学校停课，交通限流。

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Pollution from road traffic, particularly diesel fumes, is the most significant cause of poor air quality in most cities.

BBC: Court reserves UK air quality ruling

People are heavily dependent on cars, the air quality is poor and access to green space is haphazard.

ECONOMIST: Greening Houston

They lean toward making poor quality ads and then saturating the airwaves with them, he said, resulting in an air war that drains campaign coffers and turns voters off.

CNN: latimes.com: A Nader action figure? Ad maverick signs on to team