Fig. 3

Relationship between PM_2.5 concentration (μg/m³) and CVD outpatient visits on different lag days. a: Daily CVD outpatient visits (LSmeans±SE). B: Odds ratios for the increase in daily CVD outpatient visits. a and b were adjusted for days of the week, months, air temperature and relative humidity. Italics indicate significant differences (P < 0.05)