Elemental concentration of the suspended particulate matter in the air of Tehran

A network of 10 sampling stations for the monitoring of elemental concentra tion of suspended particulate matter in the air of Tehran was established. Instrumental neutron activation analysis and atomic absorption spectrometry techniques were used for analysis of the filter samples collected during t he period March 1994 - February 1995. Assessment of the results using the t wo techniques produced the following 21 elements with concentrations in uni ts of mu g/m(3): Al 3.27 (+/-23%), As 0.013 (+/-32%), Br 0.43 (+/-30%), Ca 6.96 (+/-24%), Ce 0.014 (+/-16%), Co 0.008 (+/-18%), Cr 0.048 (+/-34%), Cs 0.006 (+/-22%), Fe 2.23 (+/-25%), K 2.15 (+/-24%), Mg 1.81 (+/-23%), Mn 0.0 78 (+/-25%), Na 1.68 (+/-21%), Ni 0.037 (+/-23%), Ph 1.02 (+/-47%), Sb 0.02 8 (+/-82%), Sc 0.001 (+/-17%), Se 0.002 (+/-31%), Ti 0.54 (+/-24%), V 0.019 (+/-31%), and Zn 0.327 (+/-12%). (C) 1999 Elsevier Science Ltd.