Fig. 1
HR (95% CI) for hypertension incidence with each IQR increase in PM2.5 and its components in the main model. Abbreviations: HR, hazard ratio; CI, confidence interval; IQR, interquartile range; BC, black carbon; SO42鈭�, sulphate; OM, organic matter; NH4+, ammonium; NO3鈭�, nitrate PM2.5, fine particulate matter. Notes: The time-varying Cox model was adjusted by age, sex, educational qualifications, marital status, residence, BMI, drinking and smoking status, diabetes prevalence, cooking fuel, relative humidity, and temperature