A U.S. study of over 400,000 women found that living in areas with higher air pollution is linked to an increased risk of developing breast cancer, even when pollution levels are below current regulatory standards. Each 10 ppb increase in nitrogen dioxide (NO?) was associated with about a 3% increase in overall breast cancer risk. Higher levels of fine particulate matter (PM?.?) were tied to a roughly 14% higher risk of hormone receptor-negative breast cancer, a subtype that is more aggressive and harder to treat. The increased risks were particularly pronounced in the U.S. Midwest and in lower-income neighborhoods, suggesting environmental injustice and…

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