External environmental causes of cancer are factors in the environment that increase risk of cancer such as air pollution, UV radiation and indoor radon.

外部环境致癌因素是指环境中导致罹患癌症的危险升高的因素，如空气污染、紫外线辐射及室内的氡等。

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The World Health Organization has listed indoor air pollution as one of five environment factors that badly endanger the public health.

室内空气污染已被世界卫生组织列为对公众健康危害最大的五种环境因素之一。

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Gaudi is the professional testing of indoor air quality, indoor decoration pollution of the environment and testing organizations.

高迪公司是专业检测室内空气质量、室内环境和装修污染的检测机构。

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