Short-term changes in ambient particulate matter and risk of stroke: a systematic review and meta-analysis.

Eighth, given a borderline significant increase in risk of hospital admission for ischemic stroke associated with PM 2.5 within 24 hours but not 48 hours of onset, more studies are need to evaluate the temporal window of PM 2.5 exposure most relevant to ischemic stroke and subtypes.

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Five additional studies 8 , 45 – 46 , 50 , 52 reported positive associations that did not reach statistical significance and the remaining 4 studies 36 , 48 – 49 , 53 found no evidence of a positive association.

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