Figure 4.

Excess risk (%) and 95% confidence intervals (CIs) for mortality per 10-μg/m3 increase in the concentrations of six ambient air pollutants, stratified by sex, age, and season. The warm period was from May 1 to September 30, and the cool period was from October 1 to April 30. Statistically significant estimates are highlighted in bold. &, #Statistically significant between-group differences.