In a systematic review and meta-analysis, a team of researchers from Edinburgh University looked at the association between short-term air pollution exposure and stroke-related hospital admissions and deaths.In total, they analysed 103 observational studies that covered 28 countries across the world. The results, published in The BMJ, showed an association between carbon monoxide (1.5 percent increased risk per 1 ppm), sulphur dioxide (1.9 percent per 10 ppb) and nitrogen dioxide (1.4 percent per 10 ppb) and stroke-related hospital admissions or death.

Both PM 2.5 and PM 10 were associated with hospital admissions or deaths due to stroke, by 1.1 percent and 0.3 percent per 10 Aug/m3 increment, respectively.The first day of air pollution exposure was found to have the strongest association.

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