Overall, the proposed project aims to determine temporal variability in methane emission rates from abandoned, inactive, and suspended oil and gas (AISOG) wells in Canada at the hourly and

seasonal/multi-year time scales with continuous and repeat measurements. Understanding temporal variability is important for interpreting available point-in-time measurements, improving methane emission estimates in national inventories, and developing appropriate monitoring strategies and policies. In addition, the temporal variability can provide insight into well integrity and subsurface fluid dynamics, all of which are important for developing costeffective and efficient repair strategies. The project will focus on sites in Alberta and Saskatchewan where most AISOG wells in Canada are located.