The dataset contains methane (CH4) data collected by a LI-7810 instrument on a mobile measurement platform, collected as part of the ACES mobile survey campaigns from 2023-2024. The LI-7810 Trace Gas Analyzer was manufactured by LI-COR Environmental (Lincoln, NE, USA). This instrument is capable of measuring CH4 from 0 to 100 parts per million (ppm), with a precision of 0.60 parts per billion (ppb) at 2 ppm with 1 second averaging or 0.25 ppb at 2 ppm with 5 second averaging. Data collected includes measurements from the Sarnia region in Ontario, as well as several locations in Quebec.