We noted that satellites paired with atmospheric inversion or other emissions estimation techniques were an emerging method to quantify total city-level CH4 emissions in the studies. We attribute this to recent advancements in satellite-based sensor technology and CH4 retrieval algorithms, which have made higher resolution observations of CH4 emissions from different sources possible , and growing interest in monitoring CH4 emissions from urban areas to track and confirm reductions . The Tropospheric Monitoring Instrument (TROPOMI) onboard the European Space Agency's Sentinel 5-P platform was the only satellite featured in studies that reported TD estimates of emissions at the city-level. This is unsurprising given that TROPOMI measures column-averaged dry air CH4 mixing ratio with a 7 x 5.5 km 2 pixel resolution with daily global coverage, a suitable configuration for quantifying total emissions from area sources like cities .