Figure 4From: Cardio-respiratory outcomes associated with exposure to wildfire smoke are modified by measures of community health Excess relative risk of emergency department visits for congestive heart failure a) on the day of the exposure (at lag 0), b) on the day following the exposure (lag1). Stars denote statistically significant difference in risk between two groups of counties. Estimates are reported per 100 μg/m3 of PM2.5. Back to article page