The air conditions are uncertain, please fasten your seat belts.

天气情况不稳定，请系好您的安全带。

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To optimize the natural light and air conditions, the building is orientated to the south and pushed to the northern site line.

为了优化自然采光和通风条件，建筑采用南向布局，并将整个建筑体块沿基地的北端的基地红线布置。

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In contrast, a single monitor operated by the United States Embassy in downtown Beijing, where traffic is heavy, consistently reports less healthy air conditions than the official index.

与此相反，位于北京高郊的美国驻华大使馆依其自已的一套监测设备则持续显示，有利有身体健康的空气质量状况统计数据要差于官方数据。

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"It is not just a case of understanding the activity at the volcano itself, what we are also seeing the effect of at the moment are the prevailing weather conditions because we are in a northerly air stream at the moment and that is bringing the volcanic dust from Iceland down over the U.K.

VOA: standard.2010.04.15

The Environmental Protection Agency, together with other federal, state, local, and tribal agencies, developed AIRNow.gov, offering the public daily Air Quality Index forecasts and real-time Air Quality Index conditions for over 300 cities across the country as well as links to detailed state and local air quality cites.

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The researchers used a biological air chamber to replicate conditions in one- and two-bed hospital rooms.

BBC: Fears over risk of air transmission of superbugs

Once there, in the sweltering heat and stifling air, they work in harsh conditions.

ECONOMIST: South Africa