International Science Community Association International Research Journal of Environmental Sciences 2319-1414 11 3 2022 07 22 An Assessment of Ambient Air Quality in Kathmandu Valley, Nepal 10 15 EN Meghwal Deva Ram 1 Department of Geology, Govt. Dungar College Bikaner, 334001, India Parihar Ravi 2 Department of Botany, Govt. Dungar College Bikaner, 334001, India Shrestha Sushila Devi 1 Central Department of Botany, Tribhuvan University, Kathmandu Nepal > Research Paper 2021 12 12 2022 07 22 Road widening activity, the growing vehicles were being contamination of dust, smokes in air quality of Kathmandu valley. It has been a concern for environment. In this study, ambient air quality was monitored through field and laboratory analyses by using nine different parameters at different locations of Kathmandu valley. The particulate matters, PM10 ranged between 127 and 1193µg/m3 and PM2.5 ranged between 23 and 105µg/m3. The total suspended particles (TSP) at different location ranged between 240 and 1390µg/m3. These analytical values were higher than National Ambient Air Quality Standard values in Kathmandu. Gaseous pollutants like, SO2, NO2, benzene, lead, and ozone were mostly within acceptable levels. These particulate matters value could be lower with the completion of road widening projects and proper traffic management in valley. The stable city is recommended to continue the air monitoring system and bring suitable environment along with developmental activities. Copyright@ International Science Community Association