Mmastodon EnvironmentClimate first seen 11 h ago, last 9 h ago, peak #2
Mauna Loa records September CO2 at 426 ppm
Original: Monthly CO2 Atmospheric Concentration From the Mauna Loa Observatory, Hawaii September 2026: 426.07 ppm September 2025:
New figures from NOAA's Mauna Loa Observatory in Hawaii show atmospheric carbon dioxide at 426.07 ppm in September 2026, up from 424.37 ppm a year earlier, an increase of 1.7 ppm. The reading adds to the long-running record used to track global warming, and climate observers are sharing the numbers to highlight the continued year-on-year rise in greenhouse gas concentrations.
Why now: The latest monthly CO2 reading shows emissions-driven concentrations still climbing year over year, renewing attention on climate trends.
Mauna Loa ObservatoryNOAAHawaii
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Evidence
- Monthly CO2 Atmospheric Concentration From the Mauna Loa Observatory, Hawaii September 2026: 426.07 ppm September 2025: 424.37 ppm More: https:// gml.noaa.gov/ccgg/trends # co2 # globalwarming # climatechange # temperature # weather # maunaloaobservatory · stuart@social.sydenham.org.uk · 6
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