Personal Exposure to PM 10 Among Bus Drivers in Sari, Iran

Personal exposures to PM 10 were measured at the breathing zone in bus drivers' during 30 days of one calendar year over 6 routes in Sari city centre. The mean exposure of the drivers to PM 10 was higher in autumn and winter than measured in spring and summer. Exposures to PM 10 during high traffic flow in the evening were considerably higher than those measured in the morning and afternoon. The numbers of passenger on the bus, bus model and ambient temperature were found to have a significant effect on exposure to PM 10 . Penetration of outdoor particulate air pollution and re-suspension of suspended fine particles in the bus were most probably the main sources of the bus drivers' personal exposure to PM 10 .