Fig. 4.
Lag-0 PM2.5 and risk of MI across strata of regional OPGSH Legend: Ambient PM2.5 and risk of emergency room visits for myocardial infarction at different values of regional OPGSH. Risk estimates reflect a 5 μg/m3 change in Lag-0 PM2.5. All models are adjusted for 3-day mean ambient temperature and relative humidity