Indoor ornament, air conditioning and central heating system and a wide application of chemical articles in everyday have resulted in serious indoor air contamination.

由于室内装修、暖通空调及大量家用化工产品的使用，室内空气污染日趋严重。

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Objective To study the air contamination situation and analyse infuluencing factors of the bacteria in the air under dynamic condition in the biological safety cabinet(BSC) room.

目的研究生物安全柜在动态条件下柜内空气细菌污染情况及其影响因素分析。

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Examples range from contamination of the food or water supply, to high levels of air or noise pollution, a chemical accident, a disease outbreak or a natural disaster.

这方面例子的范围包括从食物或水供应的污染，到空气或噪音高度污染、化学事故、疾病暴发或自然灾害。

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Beijing Times says authorities must also act quickly to introduce acceptable quality standards for bottled drinking water to allay public fears about contamination from deteriorating air and water quality as well as polluting industries.

BBC: China media: Fake food scandals