The CAMS Methane Hotspot Explorer shows large methane plumes from strongly emitting localised sources detected using the operational Copernicus Sentinel-5P TROPOMI methane satellite data. The TROPOMI instrument provides daily global coverage of methane concentrations at up to 7 x 5.5 km<sup>2</sup> spatial resolution. These observations allow us to detect large methane plumes around the world, which are provided here on a weekly basis. The methane plumes are detected using a machine learning approach that has been trained based on methane scenes with known emission plumes.
The world map shows the estimated source origins of detected plumes based on the most upwind TROPOMI pixel included in the plume. These locations come with large uncertainty as the kilometer-scale resolution of the individual TROPOMI observations (pixels) does not allow the identification of specific facilities as the source of the emissions. Additionally, the detected plume may be related to a transient emission event and could therefore have drifted away from the source.
The viewer also provides an estimated source category based on the most prominent emission source category in the area where the plume has been detected based on bottom-up emission inventories. For this classification, only source categories that are regularly leading to large methane plumes are considered: coal, oil, gas, and solid waste.
Detected plumes are uploaded on a weekly basis. The number of detections fluctuates from week to week because of varying emissions, cloud cover, and viewing geometry. The explorer only shows the clearest and most confident plumes. The detections exclude larger-scale spread-out enhancements such as seen over wetland areas.