Thuduhena,Y. BRuhunuge,R. D. RPremasiri,H. D. S2026-09-212026-09-212026-05-02ISSN 1012 - 8999https://dr.ichemc.ac.lk/handle/123456789/499Abstract No: 2025_433 Page No 92Particulate matter (PM₂.₅) is a major air pollutant that poses significant environmental and public health concerns. The Colombo Metropolitan City (CMC) is influenced by multiple pollution sources, including urban emissions, industrial activities, and regional atmospheric transport.enParticulate Matter (PM₂.₅)Water-Soluble AnionsUrban Air PollutionSecondary Aerosol FormationColombo Metropolitan CityAssessment of PM₂.₅-bound water-soluble anions during episodic air pollution events in Colombo Metropolitan City, Sri LankaArticle