Sulphates, nitrates, and chlorides in particle fractions of different size.

This paper describes a pilot study of chloride, nitrate, and sulphate content in thoracic and high-risk respirable fractions of airborne particles. Samples were collected at one measuring site in Zagreb in autumn 1998 and spring 1999. The results showed that almost total chloride, nitrate, and sulphate content was present in the respirable particle fraction. The average mass contribution of these pollutants to the particle mass amounted to 25%. Although chloride mass concentrations were quite low, the findings indicated that all pollutants originated from the same source.