If you have A, B, or AB blood type, you might be more at risk of suffering a heart attack during periods of significant air pollution, than those with the O blood type, finds a new research. The findings showed that when pollution hits the mark of 25 micrograms per cubic metre, it increases the risk for people with non-O blood types. "Once you go above that, each additional 10 micrograms of pollution per cubic metre of air provided substantially higher risks," said lead investigator Benjamin Horne, clinical epidemiologist from the Intermountain Heart Institute in Utah, US.

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