Lung and female
breast cancers are highly prevalent worldwide. Although the association between exposure to ambient fine particulate matter (PM
2.5) and lung cancer has been recognized, there is less evidence for associations with other common air pollutants such as nitrogen dioxide (NO
2) and ozone (O
3). Even less is known about potential associations between these pollutants and
breast cancer. We conducted a population-based cohort study to investigate the associations of chronic exposure to PM
2.5, NO
2, O
3 and redox-weighted average of NO
2 and O
3 (O
x) with incident lung and
breast cancer, using the Ontario Population Health and Environment Cohort (ONPHEC), which includes all long-term residents aged 35–85 years who lived in Ontario, Canada, 2001–2015. Incident lung and
breast cancers were ascertained using the Ontario Cancer Registry. Annual estimates of exposures were assigned to the residential postal codes of subjects for each year during follow-up. We used Cox proportional-hazards models adjusting for personal- and neighborhood-level covariates. Our cohorts for lung and
breast cancer analyses included ~4.9 million individuals and ~2.5 million women, respectively. During follow-up, 100,146 incident cases of lung cancer and 91,146 incident cases of
breast cancer were diagnosed. The fully adjusted analyses showed positive associations of lung cancer incidence with PM
2.5 (hazard ratio [HR] = 1.02 [95% CI: 1.01–1.05] per 5.3 μg/m
3) and NO
2 (HR = 1.05 [95% CI: 1.03–1.07] per 14 ppb). No associations with lung cancer were observed for O
3 or O
x. Relationships between PM
2.5 and NO
2 with lung cancer exhibited a sublinear shape. We did not find compelling evidence linking air pollution to
breast cancer.
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