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noaa global monitoring laboratory — 1 pages

Reference How to Read NOAA's Mauna Loa CO2 Record — Monthly Means, Annual Increase and Preliminary Values NOAA Mauna Loa CO2 (ppm, one Hawaii site): September 2026 at 426.07 (preliminary), +1.70 on a year earlier; 2025 annual mean 427.35; 2025 Jan-Dec increase 2.23 vs 3.33 in 2024. Science · Nov 13