(National Oceanic and Atmospheric Administration) Multiple Sites: Continuous Hourly, Daily, Monthly averaged In-situ ch4 measurements from Baseline Observatories. These directories contain atmospheric CH4 in units of dry-air mole fraction from 3 NOAA GML observatories: Utqiaġvik, Alaska (BRW), Mauna Loa, Hawaii (MLO), and American Samoa (SMO).
Link to Dataset
Hourly, Daily, Monthly averages of Methane In-situ measurements from baseline observatories
Date last updated: 2026