Abstract: Currently 516 tonnes of municipal solid waste per day are generated in Kathmandu, Nepal, the majority of which is taken to landfill. This is projected to rise to 745 tons per day by 2025. Landfill is a source of greenhouse gas emissions, most notably methane (CH4). This study assessed the CH4 emissions from a landfill site in Kathmandu for five scenarios: S0, S1, S2, S3 and S4. The results showed that CH4 emissions are extremely high at 15,136 thousand m3 for scenario S0 - “Business as usual”. A significant reduction of 53% of CH4 emissions was achieved with gas capture (S1).