Figure 4.

Combined relative risks (RRs) and 95% confidence intervals of suicide stratified by (A) sex (M, males; F, females), (B) age groups (Y, 10–24 y; I, 25–64 y; E, $\ge 65\text{years}$), and (C) method of suicide (V, violent suicide; N, nonviolent suicide) per interquartile range increase in the average 0–1 d concentration of nitrogen dioxide (${\text{NO}}_2$), sulfur dioxide (${\text{SO}}_2$), particulate matter with aerodynamic diameter $\le 10\mathrm{\mu }\mathrm{m}$; (${\mathrm{PM}}_{10}$), particulate matter with aerodynamic diameter $\le 2.5\mathrm{\mu }\mathrm{m}$ (${\mathrm{PM}}_{2.5}$), and coarse particulate matter (${\mathrm{PM}}_{10-2.5}$) after adjusting for potential confounders (i.e., ambient temperature, sunshine duration, day-of-week, public holiday, seasonality, and long-term time trend) in single-pollutant models.