 One of Keppel-Aleks' most notable published works, “Emissions of greenhouse gasses from a North American megacity”, examines emissions of greenhouse gasses (specifically CO and CH4) around the Los Angeles metro area, otherwise known as the South Coast air basin (SCB).In their study, Keppel Aleks and her fellow researchers looked at data taken from the Jet Propulsion Laboratory using FTS column measurements, examining solar energy and greenhouse gas patterns in the atmosphere.Through their data collection, the group discovered that urban areas contribute more to the global greenhouse gas, specifically CH4 or methane gas, emissions than is currently predicted by previous greenhouse gas calculations (such as those done by the California Air Resource Board (CARB)).