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Following a previous study in Montreal published in 2010, these researchers investigated air pollution in eight Canadian provinces, from 1975 to 1994, based on satellite observations and on-ground measurements of NO₂.

Led by Perry Hystad (Oregon State University) and Paul J. Villeneuve (Carleton University), the study shows an association between the risk of breast cancer and nitrogen dioxide (NO₂), a marker of traffic-related air pollution. For post-menopausal women, the risk increased by 10% for each increase of 10 parts per billion (ppb) of NO₂. Little was known about the risk for premenopausal women and air pollution and the investigators found it was even greater: the risk increased by 32% for every additional 10 ppb of NO₂.

鈥淎ir pollution is a complex mixture comprising hundreds of chemicals, some of which are toxic or carcinogenic,鈥� says co-author Mark Goldberg, an environmental epidemiologist at 麻豆AV.聽 鈥淣O₂ is not carcinogenic, in itself, but it is an excellent marker for traffic-related air pollution.

鈥淭his study estimates the association between air pollution and breast cancer, but causality is far from established,鈥� Goldberg cautions. 鈥淢any more studies would be needed in order for us to be able to make causal judgments.鈥�

Exposure to traffic-related air pollution and the risk of developing breast cancer among women in eight Canadian provinces: A case鈥揷ontrol study

Perry Hystad, Paul J. Villeneuve, Mark S. Goldberg, Dan L. Crouse, Kenneth Johnson, the Canadian Cancer Registries Epidemiology Research Group
Environment International Volume 74, January 2015

Picture credit:聽Osvaldo Gago - fotografar.net