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September 2025 Atmospheric CO2 Content 424.37 ppm; September 2024 422.99 ppm; September 2023 418.50
https://gml.noaa.gov/ccgg/trends/https://gml.noaa.gov/webdata/ccgg/trends/co2/co2_mm_mlo.txt
As NNadir has noted in a recent post, this would mean an annual low in September of this year. IIRC, this is different, in that most (if not all) of past annual lows for CO2 have taken place in October.
On a related note, good to know that ESRL is still tracking and recording!