公共衛生學系;Department of Public HealthHUNG, HSUEH-FENHSUEH-FENHUNGWANG, CHIU-SENCHIU-SENWANG洪雪芬王秋森2008-07-302018-06-292008-07-302018-06-292001http://ntur.lib.ntu.edu.tw//handle/246246/80936The concentrations of reactive oxygen species (ROS) in various particle size fractions were determined for the Taipei aerosols and for particles in vehicular exhausts. The concentration of ROS in ambient particles had good correlations with the intensity of photochemical reactions. The correlation coefficient between the ROS concentration and the O3 concentration was higher for smaller particles. This indicates that the intensity of photochemical reactions is a major factor affecting ROS concentration in smaller particles, especially in ultrafine particles (aerodynamic diameter < 0.18 mm).en-USUrban aerosolFine particlesFresh aerosolAged aerosoljournal article