This paper examines negative externalities in Brick Industry in Kathmandu Valley, Nepal. It discusses market failure associated with negative externalities, the government's interventions to address the issue, and the market structure of the industry. The brick industry in Nepal is underdeveloped and creates negative externalities such as air, noise, and land pollution. The government addresses the issue through pollution taxes and policies to regulate the industry. The industry falls under the market structure of perfect competition.