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Associations of air pollutions (PM2.5, PM10, NO2, and NOx) and three transitions in stratified analyses by smoking statues. Associations are expressed per IQR increase. HR, hazard ratio, PM2.5, particulate matter with aerodynamic diameter of less than 2.5 µm; PM10, particulate matter with aerodynamic diameter of less than 10 µm; NO2, nitrogen dioxide; NOx, nitrogen oxides. * , the interaction term was significant (P < 0.05).
