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Air pollution is a growing environmental problem in the major cities of the world due to growing urbanization, motorization and industrialization, Kathmandu valley is not exception. In the valley (Kathmandu, Lalitpur and Bhaktrapur cities), quantity of Particulate Matter (PM10) is higher than WHO guideline (20 $\mu$g/m3 per year \&50 $\mu$g/m3 per 24 hour). This paper presents four years (2003-2006) monitoring and analysis of PM10 from 6 different stations of Kathmandu valley as well as tried to correlate among PM...