Fig. 2

Relationship between PM₁₀ 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)