Figure 3: Estimated associations of ambient pollutant levels and ED visits within a 20-mile buffer zone: comparison of pollutant lags relative to day of visit.

Plot above shows the effect of PM_2.5 and CO on daily emergency department visits for the SCD cohort. Lag day means day prior to encounter. For example, 2-day lag refers to the pollution levels 2 days prior to encounter. Solid vertical lines represent day of encounter.