A new report says that even short-term exposure to major air pollutants increases the risk of heart attack. In an analysis of more than 100 studies conducted worldwide, researchers from the Paris Cardiovascular Research Center found that increased exposure to pollutants -- including fine particles, coarse particles, nitrogen dioxide, carbon monoxide, and sulfur dioxide -- consistently increased the health risks after even short-term exposure, or less than seven days. While the risk from pollutant exposure was relatively small, compared with factors such as high blood pressure, the number of people breathing these pollutants worldwide is so large that a sizable number of people are at risk, the study said.
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