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。
This paper reports the environment radon level by the method of the solid nuclear traces in Chengdu and Zigong.
本文报道固体核径迹法测定成都、自贡市的环境氡水平。
Radon gas in the environment, particles of the fire-resistant material asbestos and air pollution also increase the risk.
环境中 的氡气、防火材料 石棉 的颗粒以及空气污染也会增大患肺癌 的风险性。
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