1ST RESULTS OF ACIDIC AND ALKALINE CONSTITUENTS DETERMINATION IN AIR PARTICULATES OF THESSALONIKI, GREECE

Atmospheric aerosol samples were collected by a low volume sampler in a typical urban site of Thessaloniki city, from March 1989 to December 1990. The concentrations of the components Cl-, NO3-, SO42-, Na+, K+, Ca2+, Mg2+ and NH4+ were determined. Data obtained showed a significa nt correlation of SO42- with NH4+, Ca2+, Mg2+, and NO3-. The contribut ion of the sea sprays was estimated to be 47% of aerosol chlorides but only 1.5% of aerosol sulfates. Aerosol sulfates are neutralized by at mospheric ammonia to form (NH4)(2)SO4. Data evaluation considering win d direction led to the condition that local urban and industrial emiss ion sources are primarily responsible for aerosol sulfates.