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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External environmental causes of cancer are factors in the environment such as pollutants that increase risk for cancer.

外部环境致癌因素是指环境中的污染物等导致罹患癌症的危险升高的因素。

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The panel, the International Agency for Research on cancer, ACTS as an adviser to the World Health Organization, focusing on environmental and lifestyle factors that may contribute to cancer.

来自国际癌症研究署。这个研究小组是世界卫生组织的顾问，主要研究可能会引起癌变的环境因素和生活方式。

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We must be extra vigilant, The government must play its role as to make the environment safe and remove all environmental factors cancer. (OMITTED) Good sources of drinking water, he says,will stop people from going to streams and ponds, where they get infected with some of these organisms.

VOA: standard.2010.06.16

The Institute of Medicine (IOM) has just released a large-scale report reviewing the evidence for the role of certain lifestyle variables and environmental factors in breast cancer risk.

FORBES: Environmental Risks For Breast Cancer: What You Need To Know

Enhanced investments would facilitate sustained coordination across research and regulatory agencies with the objective of reducing or eliminating harmful environmental exposures and modifying social and lifestyle factors implicated in breast cancer.

FORBES: New Government Breast Cancer Report Calls for Focus on Prevention, Study of Environmental Risk Factors

More specifically, the report highlights the need to make breast cancer research more interdisciplinary, to conduct more research into chemical and physical environmental factors, and to improve the Toxic Substances Control Act (TSCA).

FORBES: New Government Breast Cancer Report Calls for Focus on Prevention, Study of Environmental Risk Factors