Study of Taxi Dirver s Exposure to Respirable Particles (PM 2.5) in Bojnord City

Recent studies indicate that the released caused by traffic jams to increase mortality and hospitalization of patients as a result of cardiovascular disease This study tries to investigate the density of PM2.5 dust particles to which taxi drivers are exposed in Bojnord. In this study, the density of PM2.5 dust particles was measured for 677 taxi drivers in 12 main routes of Bojnord in 10 months using a sampling and direct decomposing instrument namely, Micro Dust Pro, to getter with a calibrated personal pump with debit 3.5 lit/min. The results of this study showed that the mean of exposure of drivers with PM2.5, is 108.08 ± 229.64 μgm-3. The minimum exposure for all drivers is 62.37± 79.95 μgm-3 and the highest exposure is 151.06± 96.396 μgm-3.Environmental factors also affected the driver exposure level, with the highest exposure at wind speeds (12ms-1, 134 ± 311.9 μgm-3), wind direction 90-180 (144.8 ± 205 μgm-3) In relative humidity, 81-100% (119 ± 250.9 μgm-3), in cloudy weather (151.7 ± 297.1 μgm-3), and kind of route (on the Shahid street to the airport) (151 ± 370 μgm-3). The results of this study showed that the mean of exposure of drivers with PM2.5, is 108.08 ± 229.64 μgm-3. The minimum exposure for all drivers is 62.37± 79.95 μgm-3 and the highest exposure is 151.06± 96.396 μgm-3.Environmental factors also affected the driver exposure level, with the highest exposure at wind speeds (12ms-1, 134 ± 311.9 μgm-3), wind direction 90-180 (144.8 ± 205 μgm-3) In relative humidity, 81-100% (119 ± 250.9 μgm-3), in cloudy weather (151.7 ± 297.1 μgm-3), and kind of route (on the Shahid street to the airport) (151 ± 370 μgm-3). Keywords: Respirable Particles, PM2.5, Individual Exposure, Taxi Driver