بررسی نحوه پراکنش ذرات سرب در هوای شهر همدان از آذرماه 76 تا خردادماه 77

          To determine the distribution of lead in ambient air of Hamadan, 100    samples were taken in different places from December 1997 until June 1998.           The places of samples collection , were divided to three locations in    street (high traffic, medium traffic and low traffic), gas pump stations and    parking of cars. Portable sampling pump and filter cellulose were used to    obtain samples. The samples transferred to laboratory and analyzed with    atomic absorption spectrophtometry. The results showed the concentration    of lead was 1mg/m3  in low traffic and 18 mg/m3    in high traffic places.           The average concentration of lead in high traffic, medium traffic and    low traffic were 7.99 , 4.63, 3.80 mg/m3 respectively and have significant    difference among concentration of lead in low traffic places with gas    stations and parking of cars.           The average concentrations of lead in ambient air of Hamadan  was    more than the standard limit (1.5 mg/m3 ) in ambient air recommended by     World Health Organization (WHO), and United States Environment Protection    Agency (USEPA).