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The Environment Performance Index (EPI), which ranks 180 countries of the world based on high-priority nine environmental issues compromised of more than 20 indicators has ranked Nepal as 149th out of 180 countries on overall issues but 177th out of 180 on air quality issues just above India, China and Bangladesh in 2016 [1]. The primary source of anthropogenic emission of various airborne pollutants is from the burning of fossil fuels during the combustion processes such as heating, power generation, motorised road traffic or ships and using solid fuel for domestic purposes [2]. Air pollution is a complex mixture of many components; chiefly particulate matters, sulphur dioxides, volatile organic compounds and oxides of nitrogen [3]. Although no safe limit concentration of air pollution has been identified below which air pollution has no effect on population health, different guidelines and target values have …