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。
External environmental causes of cancer are factors in the environment that increase risk of cancer such as air pollution, UV radiation and indoor radon.
其他的病因包括氡，石棉的过度接触和过度暴露于空气污染。
Other causes include over exposure to radon, asbestos and air pollution.
《民用建筑工程室内环境污染控制规范》(GB50325- 2001)是民用建筑工程土壤氡浓度测量方法的主要依据。
Code for Indoor Environmental Pollution Control of Civil Building Engineering (GB50325-2001) is the main norm used for soil radon concentration measurement.
然而工业废渣中存在着氡和放射性污染。
However, we have to see the following radon and radioactive pollution in industrial waste residue.
避免环境危害，减少对氡、石棉和大气污染的接触。
Avoid environmental hazards such as radon, asbestos and air pollution.
由此方程导出了入风流未受污染和受污染两种情况下的排氡子体风量计算公式。
The calculating formula of ventilation flow were derived from the accumulation equation for eliminating radon daughters in the inlet flow with or without contamination.
论述了由于建筑装修不当所导致的各种环境问题，包括室内氨气、甲醛、苯、氡的污染、石材的放射性污染。
In this article some environmental problems caused by improper building decoration are discussed, which contain indoor ammonia, formaldehyde, benzene, pollution of radon and radioactive pollution.
文章通过对室内空气污染物成因的分析，指出目前室内空气主要污染物为甲醛、苯系物、氨和氡。
This article analyses the reasons of the indoors air pollution production and brings up the pollution mainly consists of formaldehyde, benzene series, ammonia and radon.
室内空气污染物主要有甲醛、氡、氨、总挥发有机物(TVOC)、苯等。
Indoor air pollutants are formaldehyde, radon, ammonia, total volatile organic compounds (TVOC), such as benzene.
甲醛、IP以及BT、HS含量、氡等主要污染物均未超出国家有关卫生标准的限定值。
The concentrations of main pollutants, CO 2, CO, formaldehyde, IP, BT, HS and radon, met the National Hygiene Standard.
甲醛、IP以及BT、HS含量、氡等主要污染物均未超出国家有关卫生标准的限定值。
The concentrations of main pollutants, CO 2, CO, formaldehyde, IP, BT, HS and radon, met the National Hygiene Standard.
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