HUMANITYVECTOR

Atmospheric CO2 at Mauna Loa, monthly mean

Observed

Monthly mean CO2 mole fraction at Mauna Loa Observatory, parts per million (the Keeling curve).

Ingestedfrom NOAAfreshJSON export
Current value, United States
429.12ppm
period 2026-07-01
Geography
United States (USA)
Observation date
2026-07-01
Unit
ppm
Frequency
monthly
Ingested
2026-09-07 20:00 UTC
1-year change-2.32improving-0.54%2026-06-01 to 2026-07-01from 431.44 to 429.12 ppm
10-year trend+0.11% per yearworsening+1.12%2025-09-01 to 2026-07-01compound annual growth rate; total +4.75 ppm, from 424.37 to 429.12 ppm
Historical series

Atmospheric CO2 at Mauna Loa, monthly mean, United States

Observed
3003253503754004254501958-03-011966-10-011975-05-011983-12-011992-07-012001-02-012009-09-012018-04-012026-07-01PPM429.12
821 observations, 1958-03-01 to 2026-07-01latest point emphasised
Data table (821 rows)
Atmospheric CO2 at Mauna Loa, monthly mean, United States: 821 observations from 1958-03-01 to 2026-07-01, values from 312.42 to 432.34 ppm. Latest 429.12 ppm in 2026-07-01. Full data table below.
PeriodValue (ppm)Source revisionIngested at
2026-07-01429.122026-08-052026-09-07 20:00 UTC
2026-06-01431.442026-08-052026-09-07 20:00 UTC
2026-05-01432.342026-08-052026-09-07 20:00 UTC
2026-04-01431.122026-08-052026-09-07 20:00 UTC
2026-03-01430.152026-08-052026-09-07 20:00 UTC
2026-02-01429.352026-08-052026-09-07 20:00 UTC
2026-01-01428.622026-08-052026-09-07 20:00 UTC
2025-12-01427.492026-08-052026-09-07 20:00 UTC
2025-11-01426.462026-08-052026-09-07 20:00 UTC
2025-10-01424.872026-08-052026-09-07 20:00 UTC
2025-09-01424.372026-08-052026-09-07 20:00 UTC
2025-08-01425.482026-08-052026-09-07 20:00 UTC
2025-07-01427.872026-08-052026-09-07 20:00 UTC
2025-06-01429.612026-08-052026-09-07 20:00 UTC
2025-05-01430.512026-08-052026-09-07 20:00 UTC
2025-04-01429.642026-08-052026-09-07 20:00 UTC
2025-03-01428.152026-08-052026-09-07 20:00 UTC
2025-02-01427.092026-08-052026-09-07 20:00 UTC
2025-01-01426.652026-08-052026-09-07 20:00 UTC
2024-12-01425.42026-08-052026-09-07 20:00 UTC
2024-11-01423.852026-08-052026-09-07 20:00 UTC
2024-10-01422.382026-08-052026-09-07 20:00 UTC
2024-09-01422.032026-08-052026-09-07 20:00 UTC
2024-08-01422.992026-08-052026-09-07 20:00 UTC
2024-07-01425.552026-08-052026-09-07 20:00 UTC
2024-06-01426.912026-08-052026-09-07 20:00 UTC
2024-05-01426.92026-08-052026-09-07 20:00 UTC
2024-04-01426.512026-08-052026-09-07 20:00 UTC
2024-03-01425.382026-08-052026-09-07 20:00 UTC
2024-02-01424.552026-08-052026-09-07 20:00 UTC
2024-01-01422.82026-08-052026-09-07 20:00 UTC
2023-12-01421.862026-08-052026-09-07 20:00 UTC
2023-11-01420.462026-08-052026-09-07 20:00 UTC
2023-10-01418.822026-08-052026-09-07 20:00 UTC
2023-09-01418.52026-08-052026-09-07 20:00 UTC
2023-08-01419.682026-08-052026-09-07 20:00 UTC
2023-07-01421.832026-08-052026-09-07 20:00 UTC
2023-06-01423.682026-08-052026-09-07 20:00 UTC
2023-05-01424.012026-08-052026-09-07 20:00 UTC
2023-04-01423.32026-08-052026-09-07 20:00 UTC
2023-03-014212026-08-052026-09-07 20:00 UTC
2023-02-01420.312026-08-052026-09-07 20:00 UTC
2023-01-01419.472026-08-052026-09-07 20:00 UTC
2022-12-01418.992026-08-052026-09-07 20:00 UTC
2022-11-01417.472026-08-052026-09-07 20:00 UTC
2022-10-01415.742026-08-052026-09-07 20:00 UTC
2022-09-01415.912026-08-052026-09-07 20:00 UTC
2022-08-01417.152026-08-052026-09-07 20:00 UTC
2022-07-01418.852026-08-052026-09-07 20:00 UTC
2022-06-01420.942026-08-052026-09-07 20:00 UTC
2022-05-01420.972026-08-052026-09-07 20:00 UTC
2022-04-01420.192026-08-052026-09-07 20:00 UTC
2022-03-01418.762026-08-052026-09-07 20:00 UTC
2022-02-01419.242026-08-052026-09-07 20:00 UTC
2022-01-01418.132026-08-052026-09-07 20:00 UTC
2021-12-01416.672026-08-052026-09-07 20:00 UTC
2021-11-01414.972026-08-052026-09-07 20:00 UTC
2021-10-01413.92026-08-052026-09-07 20:00 UTC
2021-09-01413.262026-08-052026-09-07 20:00 UTC
2021-08-01414.422026-08-052026-09-07 20:00 UTC
2021-07-01416.92026-08-052026-09-07 20:00 UTC
2021-06-01418.932026-08-052026-09-07 20:00 UTC
2021-05-01419.092026-08-052026-09-07 20:00 UTC
2021-04-01419.012026-08-052026-09-07 20:00 UTC
2021-03-01417.612026-08-052026-09-07 20:00 UTC
2021-02-01416.722026-08-052026-09-07 20:00 UTC
2021-01-01415.492026-08-052026-09-07 20:00 UTC
2020-12-01414.232026-08-052026-09-07 20:00 UTC
2020-11-01413.12026-08-052026-09-07 20:00 UTC
2020-10-01411.492026-08-052026-09-07 20:00 UTC
2020-09-01411.52026-08-052026-09-07 20:00 UTC
2020-08-01412.752026-08-052026-09-07 20:00 UTC
2020-07-01414.582026-08-052026-09-07 20:00 UTC
2020-06-01416.582026-08-052026-09-07 20:00 UTC
2020-05-01417.282026-08-052026-09-07 20:00 UTC
2020-04-01416.422026-08-052026-09-07 20:00 UTC
2020-03-01414.722026-08-052026-09-07 20:00 UTC
2020-02-01414.322026-08-052026-09-07 20:00 UTC
2020-01-01413.592026-08-052026-09-07 20:00 UTC
2019-12-01411.972026-08-052026-09-07 20:00 UTC
2019-11-01410.472026-08-052026-09-07 20:00 UTC
2019-10-01408.742026-08-052026-09-07 20:00 UTC
2019-09-01408.762026-08-052026-09-07 20:00 UTC
2019-08-01410.172026-08-052026-09-07 20:00 UTC
2019-07-01411.962026-08-052026-09-07 20:00 UTC
2019-06-01414.152026-08-052026-09-07 20:00 UTC
2019-05-01414.862026-08-052026-09-07 20:00 UTC
2019-04-01413.542026-08-052026-09-07 20:00 UTC
2019-03-01412.182026-08-052026-09-07 20:00 UTC
2019-02-01411.962026-08-052026-09-07 20:00 UTC
2019-01-01411.032026-08-052026-09-07 20:00 UTC
2018-12-01409.272026-08-052026-09-07 20:00 UTC
2018-11-01408.212026-08-052026-09-07 20:00 UTC
2018-10-01406.192026-08-052026-09-07 20:00 UTC
2018-09-01405.712026-08-052026-09-07 20:00 UTC
2018-08-01407.162026-08-052026-09-07 20:00 UTC
2018-07-01408.92026-08-052026-09-07 20:00 UTC
2018-06-01410.992026-08-052026-09-07 20:00 UTC
2018-05-01411.442026-08-052026-09-07 20:00 UTC
2018-04-01410.452026-08-052026-09-07 20:00 UTC
2018-03-01409.592026-08-052026-09-07 20:00 UTC
2018-02-01408.522026-08-052026-09-07 20:00 UTC
2018-01-01408.152026-08-052026-09-07 20:00 UTC
2017-12-014072026-08-052026-09-07 20:00 UTC
2017-11-01405.312026-08-052026-09-07 20:00 UTC
2017-10-01403.822026-08-052026-09-07 20:00 UTC
2017-09-01403.572026-08-052026-09-07 20:00 UTC
2017-08-01405.322026-08-052026-09-07 20:00 UTC
2017-07-01407.332026-08-052026-09-07 20:00 UTC
2017-06-01409.082026-08-052026-09-07 20:00 UTC
2017-05-01409.892026-08-052026-09-07 20:00 UTC
2017-04-01409.222026-08-052026-09-07 20:00 UTC
2017-03-01407.542026-08-052026-09-07 20:00 UTC
2017-02-01406.662026-08-052026-09-07 20:00 UTC
2017-01-01406.362026-08-052026-09-07 20:00 UTC
2016-12-01404.642026-08-052026-09-07 20:00 UTC
2016-11-01403.722026-08-052026-09-07 20:00 UTC
2016-10-01401.792026-08-052026-09-07 20:00 UTC
2016-09-01401.232026-08-052026-09-07 20:00 UTC
2016-08-01402.452026-08-052026-09-07 20:00 UTC
2016-07-01404.592026-08-052026-09-07 20:00 UTC
2016-06-01406.992026-08-052026-09-07 20:00 UTC
2016-05-01407.92026-08-052026-09-07 20:00 UTC
2016-04-01407.62026-08-052026-09-07 20:00 UTC
2016-03-01405.062026-08-052026-09-07 20:00 UTC
2016-02-01404.252026-08-052026-09-07 20:00 UTC
2016-01-01402.732026-08-052026-09-07 20:00 UTC
2015-12-01402.062026-08-052026-09-07 20:00 UTC
2015-11-01400.272026-08-052026-09-07 20:00 UTC
2015-10-01398.492026-08-052026-09-07 20:00 UTC
2015-09-01397.822026-08-052026-09-07 20:00 UTC
2015-08-01399.112026-08-052026-09-07 20:00 UTC
2015-07-01401.462026-08-052026-09-07 20:00 UTC
2015-06-01402.972026-08-052026-09-07 20:00 UTC
2015-05-01404.152026-08-052026-09-07 20:00 UTC
2015-04-01403.352026-08-052026-09-07 20:00 UTC
2015-03-01401.742026-08-052026-09-07 20:00 UTC
2015-02-01400.552026-08-052026-09-07 20:00 UTC
2015-01-01400.182026-08-052026-09-07 20:00 UTC
2014-12-01399.082026-08-052026-09-07 20:00 UTC
2014-11-01397.42026-08-052026-09-07 20:00 UTC
2014-10-01396.162026-08-052026-09-07 20:00 UTC
2014-09-01395.542026-08-052026-09-07 20:00 UTC
2014-08-01397.182026-08-052026-09-07 20:00 UTC
2014-07-01399.272026-08-052026-09-07 20:00 UTC
2014-06-01401.432026-08-052026-09-07 20:00 UTC
2014-05-01401.962026-08-052026-09-07 20:00 UTC
2014-04-01401.512026-08-052026-09-07 20:00 UTC
2014-03-01399.912026-08-052026-09-07 20:00 UTC
2014-02-01398.272026-08-052026-09-07 20:00 UTC
2014-01-01398.042026-08-052026-09-07 20:00 UTC
2013-12-01397.032026-08-052026-09-07 20:00 UTC
2013-11-01395.362026-08-052026-09-07 20:00 UTC
2013-10-01393.92026-08-052026-09-07 20:00 UTC
2013-09-01393.722026-08-052026-09-07 20:00 UTC
2013-08-01395.392026-08-052026-09-07 20:00 UTC
2013-07-01397.512026-08-052026-09-07 20:00 UTC
2013-06-01398.812026-08-052026-09-07 20:00 UTC
2013-05-01400.022026-08-052026-09-07 20:00 UTC
2013-04-01398.642026-08-052026-09-07 20:00 UTC
2013-03-01397.662026-08-052026-09-07 20:00 UTC
2013-02-01397.032026-08-052026-09-07 20:00 UTC
2013-01-01395.782026-08-052026-09-07 20:00 UTC
2012-12-01394.572026-08-052026-09-07 20:00 UTC
2012-11-01393.22026-08-052026-09-07 20:00 UTC
2012-10-01391.272026-08-052026-09-07 20:00 UTC
2012-09-01391.322026-08-052026-09-07 20:00 UTC
2012-08-01392.592026-08-052026-09-07 20:00 UTC
2012-07-01394.562026-08-052026-09-07 20:00 UTC
2012-06-01395.912026-08-052026-09-07 20:00 UTC
2012-05-01396.932026-08-052026-09-07 20:00 UTC
2012-04-01396.382026-08-052026-09-07 20:00 UTC
2012-03-01394.592026-08-052026-09-07 20:00 UTC
2012-02-01394.042026-08-052026-09-07 20:00 UTC
2012-01-01393.312026-08-052026-09-07 20:00 UTC
2011-12-01392.062026-08-052026-09-07 20:00 UTC
2011-11-01390.482026-08-052026-09-07 20:00 UTC
2011-10-01389.192026-08-052026-09-07 20:00 UTC
2011-09-01389.282026-08-052026-09-07 20:00 UTC
2011-08-01390.332026-08-052026-09-07 20:00 UTC
2011-07-01392.722026-08-052026-09-07 20:00 UTC
2011-06-01393.952026-08-052026-09-07 20:00 UTC
2011-05-01394.412026-08-052026-09-07 20:00 UTC
2011-04-01393.442026-08-052026-09-07 20:00 UTC
2011-03-01392.82026-08-052026-09-07 20:00 UTC
2011-02-01392.052026-08-052026-09-07 20:00 UTC
2011-01-01391.52026-08-052026-09-07 20:00 UTC
2010-12-01389.992026-08-052026-09-07 20:00 UTC
2010-11-01388.872026-08-052026-09-07 20:00 UTC
2010-10-01387.432026-08-052026-09-07 20:00 UTC
2010-09-01387.032026-08-052026-09-07 20:00 UTC
2010-08-01388.542026-08-052026-09-07 20:00 UTC
2010-07-01390.412026-08-052026-09-07 20:00 UTC
2010-06-01392.382026-08-052026-09-07 20:00 UTC
2010-05-01393.212026-08-052026-09-07 20:00 UTC
2010-04-01392.672026-08-052026-09-07 20:00 UTC
2010-03-01391.372026-08-052026-09-07 20:00 UTC
2010-02-01390.412026-08-052026-09-07 20:00 UTC
2010-01-01388.912026-08-052026-09-07 20:00 UTC
2009-12-01387.632026-08-052026-09-07 20:00 UTC
2009-11-01386.232026-08-052026-09-07 20:00 UTC
2009-10-01384.642026-08-052026-09-07 20:00 UTC
2009-09-01384.952026-08-052026-09-07 20:00 UTC
2009-08-01386.292026-08-052026-09-07 20:00 UTC
2009-07-01388.242026-08-052026-09-07 20:00 UTC
2009-06-01389.72026-08-052026-09-07 20:00 UTC
2009-05-01390.362026-08-052026-09-07 20:00 UTC
2009-04-01389.762026-08-052026-09-07 20:00 UTC
2009-03-01389.042026-08-052026-09-07 20:00 UTC
2009-02-01387.72026-08-052026-09-07 20:00 UTC
2009-01-01387.172026-08-052026-09-07 20:00 UTC
2008-12-01385.792026-08-052026-09-07 20:00 UTC
2008-11-01384.412026-08-052026-09-07 20:00 UTC
2008-10-01383.222026-08-052026-09-07 20:00 UTC
2008-09-01383.412026-08-052026-09-07 20:00 UTC
2008-08-01384.322026-08-052026-09-07 20:00 UTC
2008-07-01386.622026-08-052026-09-07 20:00 UTC
2008-06-01387.992026-08-052026-09-07 20:00 UTC
2008-05-01388.782026-08-052026-09-07 20:00 UTC
2008-04-01387.332026-08-052026-09-07 20:00 UTC
2008-03-01386.282026-08-052026-09-07 20:00 UTC
2008-02-01386.062026-08-052026-09-07 20:00 UTC
2008-01-01385.782026-08-052026-09-07 20:00 UTC
2007-12-01384.192026-08-052026-09-07 20:00 UTC
2007-11-01382.72026-08-052026-09-07 20:00 UTC
2007-10-01381.372026-08-052026-09-07 20:00 UTC
2007-09-01381.22026-08-052026-09-07 20:00 UTC
2007-08-01382.242026-08-052026-09-07 20:00 UTC
2007-07-01384.732026-08-052026-09-07 20:00 UTC
2007-06-01386.332026-08-052026-09-07 20:00 UTC
2007-05-01386.782026-08-052026-09-07 20:00 UTC
2007-04-01386.732026-08-052026-09-07 20:00 UTC
2007-03-01384.812026-08-052026-09-07 20:00 UTC
2007-02-01384.122026-08-052026-09-07 20:00 UTC
2007-01-01383.12026-08-052026-09-07 20:00 UTC
2006-12-01382.022026-08-052026-09-07 20:00 UTC
2006-11-01380.352026-08-052026-09-07 20:00 UTC
2006-10-01379.332026-08-052026-09-07 20:00 UTC
2006-09-01379.042026-08-052026-09-07 20:00 UTC
2006-08-01380.62026-08-052026-09-07 20:00 UTC
2006-07-01382.652026-08-052026-09-07 20:00 UTC
2006-06-01384.242026-08-052026-09-07 20:00 UTC
2006-05-01385.222026-08-052026-09-07 20:00 UTC
2006-04-01384.82026-08-052026-09-07 20:00 UTC
2006-03-01382.862026-08-052026-09-07 20:00 UTC
2006-02-01382.42026-08-052026-09-07 20:00 UTC
2006-01-01381.582026-08-052026-09-07 20:00 UTC
2005-12-01380.312026-08-052026-09-07 20:00 UTC
2005-11-01378.542026-08-052026-09-07 20:00 UTC
2005-10-01377.192026-08-052026-09-07 20:00 UTC
2005-09-01376.892026-08-052026-09-07 20:00 UTC
2005-08-01378.932026-08-052026-09-07 20:00 UTC
2005-07-01380.932026-08-052026-09-07 20:00 UTC
2005-06-01382.42026-08-052026-09-07 20:00 UTC
2005-05-01382.642026-08-052026-09-07 20:00 UTC
2005-04-01382.482026-08-052026-09-07 20:00 UTC
2005-03-01380.952026-08-052026-09-07 20:00 UTC
2005-02-01379.912026-08-052026-09-07 20:00 UTC
2005-01-01378.632026-08-052026-09-07 20:00 UTC
2004-12-01377.682026-08-052026-09-07 20:00 UTC
2004-11-01376.332026-08-052026-09-07 20:00 UTC
2004-10-01374.632026-08-052026-09-07 20:00 UTC
2004-09-01374.432026-08-052026-09-07 20:00 UTC
2004-08-01376.172026-08-052026-09-07 20:00 UTC
2004-07-01377.652026-08-052026-09-07 20:00 UTC
2004-06-01379.872026-08-052026-09-07 20:00 UTC
2004-05-01380.82026-08-052026-09-07 20:00 UTC
2004-04-01380.542026-08-052026-09-07 20:00 UTC
2004-03-01379.062026-08-052026-09-07 20:00 UTC
2004-02-01378.052026-08-052026-09-07 20:00 UTC
2004-01-01377.172026-08-052026-09-07 20:00 UTC
2003-12-01376.172026-08-052026-09-07 20:00 UTC
2003-11-01374.842026-08-052026-09-07 20:00 UTC
2003-10-01373.312026-08-052026-09-07 20:00 UTC
2003-09-01373.342026-08-052026-09-07 20:00 UTC
2003-08-01374.572026-08-052026-09-07 20:00 UTC
2003-07-01376.882026-08-052026-09-07 20:00 UTC
2003-06-01378.462026-08-052026-09-07 20:00 UTC
2003-05-01378.782026-08-052026-09-07 20:00 UTC
2003-04-01377.922026-08-052026-09-07 20:00 UTC
2003-03-01376.642026-08-052026-09-07 20:00 UTC
2003-02-01375.822026-08-052026-09-07 20:00 UTC
2003-01-01375.072026-08-052026-09-07 20:00 UTC
2002-12-01373.982026-08-052026-09-07 20:00 UTC
2002-11-01372.432026-08-052026-09-07 20:00 UTC
2002-10-01370.732026-08-052026-09-07 20:00 UTC
2002-09-01370.922026-08-052026-09-07 20:00 UTC
2002-08-01372.032026-08-052026-09-07 20:00 UTC
2002-07-01374.162026-08-052026-09-07 20:00 UTC
2002-06-01375.692026-08-052026-09-07 20:00 UTC
2002-05-01375.932026-08-052026-09-07 20:00 UTC
2002-04-01375.192026-08-052026-09-07 20:00 UTC
2002-03-01374.32026-08-052026-09-07 20:00 UTC
2002-02-01373.372026-08-052026-09-07 20:00 UTC
2002-01-01372.72026-08-052026-09-07 20:00 UTC
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1975-08-01329.952026-08-052026-09-07 20:00 UTC
1975-07-01331.972026-08-052026-09-07 20:00 UTC
1975-06-01333.422026-08-052026-09-07 20:00 UTC
1975-05-01333.952026-08-052026-09-07 20:00 UTC
1975-04-01333.112026-08-052026-09-07 20:00 UTC
1975-03-01331.942026-08-052026-09-07 20:00 UTC
1975-02-01331.462026-08-052026-09-07 20:00 UTC
1975-01-01330.732026-08-052026-09-07 20:00 UTC
1974-12-01329.582026-08-052026-09-07 20:00 UTC
1974-11-01328.312026-08-052026-09-07 20:00 UTC
1974-10-01327.282026-08-052026-09-07 20:00 UTC
1974-09-01327.332026-08-052026-09-07 20:00 UTC
1974-08-01329.152026-08-052026-09-07 20:00 UTC
1974-07-01331.072026-08-052026-09-07 20:00 UTC
1974-06-01332.22026-08-052026-09-07 20:00 UTC
1974-05-01333.192026-08-052026-09-07 20:00 UTC
1974-04-01332.652026-08-052026-09-07 20:00 UTC
1974-03-01331.492026-08-052026-09-07 20:00 UTC
1974-02-01330.712026-08-052026-09-07 20:00 UTC
1974-01-01329.362026-08-052026-09-07 20:00 UTC
1973-12-01328.652026-08-052026-09-07 20:00 UTC
1973-11-01328.172026-08-052026-09-07 20:00 UTC
1973-10-01327.192026-08-052026-09-07 20:00 UTC
1973-09-01327.522026-08-052026-09-07 20:00 UTC
1973-08-01329.312026-08-052026-09-07 20:00 UTC
1973-07-01330.872026-08-052026-09-07 20:00 UTC
1973-06-01332.072026-08-052026-09-07 20:00 UTC
1973-05-01332.482026-08-052026-09-07 20:00 UTC
1973-04-01331.52026-08-052026-09-07 20:00 UTC
1973-03-01330.32026-08-052026-09-07 20:00 UTC
1973-02-01329.572026-08-052026-09-07 20:00 UTC
1973-01-01328.552026-08-052026-09-07 20:00 UTC
1972-12-01327.552026-08-052026-09-07 20:00 UTC
1972-11-01326.52026-08-052026-09-07 20:00 UTC
1972-10-01325.22026-08-052026-09-07 20:00 UTC
1972-09-01324.842026-08-052026-09-07 20:00 UTC
1972-08-01326.322026-08-052026-09-07 20:00 UTC
1972-07-01328.042026-08-052026-09-07 20:00 UTC
1972-06-01329.092026-08-052026-09-07 20:00 UTC
1972-05-01330.072026-08-052026-09-07 20:00 UTC
1972-04-01329.722026-08-052026-09-07 20:00 UTC
1972-03-01327.752026-08-052026-09-07 20:00 UTC
1972-02-01327.632026-08-052026-09-07 20:00 UTC
1972-01-01326.772026-08-052026-09-07 20:00 UTC
1971-12-01326.012026-08-052026-09-07 20:00 UTC
1971-11-01324.82026-08-052026-09-07 20:00 UTC
1971-10-01323.562026-08-052026-09-07 20:00 UTC
1971-09-01323.362026-08-052026-09-07 20:00 UTC
1971-08-01325.432026-08-052026-09-07 20:00 UTC
1971-07-01327.362026-08-052026-09-07 20:00 UTC
1971-06-01328.572026-08-052026-09-07 20:00 UTC
1971-05-01328.932026-08-052026-09-07 20:00 UTC
1971-04-01327.782026-08-052026-09-07 20:00 UTC
1971-03-01327.182026-08-052026-09-07 20:00 UTC
1971-02-01326.692026-08-052026-09-07 20:00 UTC
1971-01-01326.172026-08-052026-09-07 20:00 UTC
1970-12-01325.132026-08-052026-09-07 20:00 UTC
1970-11-01324.012026-08-052026-09-07 20:00 UTC
1970-10-01323.062026-08-052026-09-07 20:00 UTC
1970-09-01323.12026-08-052026-09-07 20:00 UTC
1970-08-01324.682026-08-052026-09-07 20:00 UTC
1970-07-01326.342026-08-052026-09-07 20:00 UTC
1970-06-01327.672026-08-052026-09-07 20:00 UTC
1970-05-01328.082026-08-052026-09-07 20:00 UTC
1970-04-01328.132026-08-052026-09-07 20:00 UTC
1970-03-01326.932026-08-052026-09-07 20:00 UTC
1970-02-01325.992026-08-052026-09-07 20:00 UTC
1970-01-01325.062026-08-052026-09-07 20:00 UTC
1969-12-01324.112026-08-052026-09-07 20:00 UTC
1969-11-01322.852026-08-052026-09-07 20:00 UTC
1969-10-01321.782026-08-052026-09-07 20:00 UTC
1969-09-01322.382026-08-052026-09-07 20:00 UTC
1969-08-01323.662026-08-052026-09-07 20:00 UTC
1969-07-01325.882026-08-052026-09-07 20:00 UTC
1969-06-01326.712026-08-052026-09-07 20:00 UTC
1969-05-01327.382026-08-052026-09-07 20:00 UTC
1969-04-01326.662026-08-052026-09-07 20:00 UTC
1969-03-01325.632026-08-052026-09-07 20:00 UTC
1969-02-01324.412026-08-052026-09-07 20:00 UTC
1969-01-013242026-08-052026-09-07 20:00 UTC
1968-12-01322.892026-08-052026-09-07 20:00 UTC
1968-11-01321.322026-08-052026-09-07 20:00 UTC
1968-10-01320.252026-08-052026-09-07 20:00 UTC
1968-09-01320.332026-08-052026-09-07 20:00 UTC
1968-08-01322.112026-08-052026-09-07 20:00 UTC
1968-07-01324.142026-08-052026-09-07 20:00 UTC
1968-06-01325.362026-08-052026-09-07 20:00 UTC
1968-05-01325.572026-08-052026-09-07 20:00 UTC
1968-04-01325.022026-08-052026-09-07 20:00 UTC
1968-03-01323.892026-08-052026-09-07 20:00 UTC
1968-02-01323.152026-08-052026-09-07 20:00 UTC
1968-01-01322.572026-08-052026-09-07 20:00 UTC
1967-12-01321.962026-08-052026-09-07 20:00 UTC
1967-11-01320.732026-08-052026-09-07 20:00 UTC
1967-10-01319.392026-08-052026-09-07 20:00 UTC
1967-09-01319.252026-08-052026-09-07 20:00 UTC
1967-08-01320.922026-08-052026-09-07 20:00 UTC
1967-07-01322.542026-08-052026-09-07 20:00 UTC
1967-06-01324.092026-08-052026-09-07 20:00 UTC
1967-05-013252026-08-052026-09-07 20:00 UTC
1967-04-01324.412026-08-052026-09-07 20:00 UTC
1967-03-01323.032026-08-052026-09-07 20:00 UTC
1967-02-01322.52026-08-052026-09-07 20:00 UTC
1967-01-01322.332026-08-052026-09-07 20:00 UTC
1966-12-01321.022026-08-052026-09-07 20:00 UTC
1966-11-01319.782026-08-052026-09-07 20:00 UTC
1966-10-01318.12026-08-052026-09-07 20:00 UTC
1966-09-01318.642026-08-052026-09-07 20:00 UTC
1966-08-01320.362026-08-052026-09-07 20:00 UTC
1966-07-01322.372026-08-052026-09-07 20:00 UTC
1966-06-01323.752026-08-052026-09-07 20:00 UTC
1966-05-01324.082026-08-052026-09-07 20:00 UTC
1966-04-01323.72026-08-052026-09-07 20:00 UTC
1966-03-01322.392026-08-052026-09-07 20:00 UTC
1966-02-01321.62026-08-052026-09-07 20:00 UTC
1966-01-01320.622026-08-052026-09-07 20:00 UTC
1965-12-01319.422026-08-052026-09-07 20:00 UTC
1965-11-01318.872026-08-052026-09-07 20:00 UTC
1965-10-01317.32026-08-052026-09-07 20:00 UTC
1965-09-01317.822026-08-052026-09-07 20:00 UTC
1965-08-01318.872026-08-052026-09-07 20:00 UTC
1965-07-01321.212026-08-052026-09-07 20:00 UTC
1965-06-01321.872026-08-052026-09-07 20:00 UTC
1965-05-01322.172026-08-052026-09-07 20:00 UTC
1965-04-01322.142026-08-052026-09-07 20:00 UTC
1965-03-01320.892026-08-052026-09-07 20:00 UTC
1965-02-01320.442026-08-052026-09-07 20:00 UTC
1965-01-01319.442026-08-052026-09-07 20:00 UTC
1964-12-01318.712026-08-052026-09-07 20:00 UTC
1964-11-01317.682026-08-052026-09-07 20:00 UTC
1964-10-01316.872026-08-052026-09-07 20:00 UTC
1964-09-01316.712026-08-052026-09-07 20:00 UTC
1964-08-01318.692026-08-052026-09-07 20:00 UTC
1964-07-01320.442026-08-052026-09-07 20:00 UTC
1964-06-01321.892026-08-052026-09-07 20:00 UTC
1964-05-01322.252026-08-052026-09-07 20:00 UTC
1964-04-01321.842026-08-052026-09-07 20:00 UTC
1964-03-01320.752026-08-052026-09-07 20:00 UTC
1964-02-01320.042026-08-052026-09-07 20:00 UTC
1964-01-01319.572026-08-052026-09-07 20:00 UTC
1963-12-01318.352026-08-052026-09-07 20:00 UTC
1963-11-01317.072026-08-052026-09-07 20:00 UTC
1963-10-01315.992026-08-052026-09-07 20:00 UTC
1963-09-01316.212026-08-052026-09-07 20:00 UTC
1963-08-01317.772026-08-052026-09-07 20:00 UTC
1963-07-01319.742026-08-052026-09-07 20:00 UTC
1963-06-01321.492026-08-052026-09-07 20:00 UTC
1963-05-01322.242026-08-052026-09-07 20:00 UTC
1963-04-01321.382026-08-052026-09-07 20:00 UTC
1963-03-01319.862026-08-052026-09-07 20:00 UTC
1963-02-01319.072026-08-052026-09-07 20:00 UTC
1963-01-01318.742026-08-052026-09-07 20:00 UTC
1962-12-01317.72026-08-052026-09-07 20:00 UTC
1962-11-01316.692026-08-052026-09-07 20:00 UTC
1962-10-01315.422026-08-052026-09-07 20:00 UTC
1962-09-01316.242026-08-052026-09-07 20:00 UTC
1962-08-01317.42026-08-052026-09-07 20:00 UTC
1962-07-01319.612026-08-052026-09-07 20:00 UTC
1962-06-01320.622026-08-052026-09-07 20:00 UTC
1962-05-01321.022026-08-052026-09-07 20:00 UTC
1962-04-01320.572026-08-052026-09-07 20:00 UTC
1962-03-01319.682026-08-052026-09-07 20:00 UTC
1962-02-01318.552026-08-052026-09-07 20:00 UTC
1962-01-01317.942026-08-052026-09-07 20:00 UTC
1961-12-01317.012026-08-052026-09-07 20:00 UTC
1961-11-01316.12026-08-052026-09-07 20:00 UTC
1961-10-01315.312026-08-052026-09-07 20:00 UTC
1961-09-01314.992026-08-052026-09-07 20:00 UTC
1961-08-01316.792026-08-052026-09-07 20:00 UTC
1961-07-01318.562026-08-052026-09-07 20:00 UTC
1961-06-01319.772026-08-052026-09-07 20:00 UTC
1961-05-01320.582026-08-052026-09-07 20:00 UTC
1961-04-01319.482026-08-052026-09-07 20:00 UTC
1961-03-01318.542026-08-052026-09-07 20:00 UTC
1961-02-01317.72026-08-052026-09-07 20:00 UTC
1961-01-01316.892026-08-052026-09-07 20:00 UTC
1960-12-01316.192026-08-052026-09-07 20:00 UTC
1960-11-013152026-08-052026-09-07 20:00 UTC
1960-10-01313.832026-08-052026-09-07 20:00 UTC
1960-09-01314.172026-08-052026-09-07 20:00 UTC
1960-08-01315.92026-08-052026-09-07 20:00 UTC
1960-07-01318.182026-08-052026-09-07 20:00 UTC
1960-06-01319.582026-08-052026-09-07 20:00 UTC
1960-05-01320.032026-08-052026-09-07 20:00 UTC
1960-04-01319.032026-08-052026-09-07 20:00 UTC
1960-03-01317.582026-08-052026-09-07 20:00 UTC
1960-02-01316.982026-08-052026-09-07 20:00 UTC
1960-01-01316.432026-08-052026-09-07 20:00 UTC
1959-12-01315.582026-08-052026-09-07 20:00 UTC
1959-11-01314.812026-08-052026-09-07 20:00 UTC
1959-10-01313.332026-08-052026-09-07 20:00 UTC
1959-09-01313.842026-08-052026-09-07 20:00 UTC
1959-08-01314.82026-08-052026-09-07 20:00 UTC
1959-07-01316.542026-08-052026-09-07 20:00 UTC
1959-06-01318.152026-08-052026-09-07 20:00 UTC
1959-05-01318.292026-08-052026-09-07 20:00 UTC
1959-04-01317.722026-08-052026-09-07 20:00 UTC
1959-03-01316.652026-08-052026-09-07 20:00 UTC
1959-02-01316.492026-08-052026-09-07 20:00 UTC
1959-01-01315.582026-08-052026-09-07 20:00 UTC
1958-12-01314.672026-08-052026-09-07 20:00 UTC
1958-11-01313.332026-08-052026-09-07 20:00 UTC
1958-10-01312.422026-08-052026-09-07 20:00 UTC
1958-09-01313.212026-08-052026-09-07 20:00 UTC
1958-08-01314.932026-08-052026-09-07 20:00 UTC
1958-07-01315.872026-08-052026-09-07 20:00 UTC
1958-06-01317.272026-08-052026-09-07 20:00 UTC
1958-05-01317.512026-08-052026-09-07 20:00 UTC
1958-04-01317.452026-08-052026-09-07 20:00 UTC
1958-03-01315.712026-08-052026-09-07 20:00 UTC
1 geographies have observations for this metric
NOAA, NOAA NCEI access data service, series gml:co2_mm_mlo
Definition

What this measures

Monthly mean CO2 mole fraction in dry air (ppm) at Mauna Loa Observatory, constructed from daily means and corrected to the centre of the month, the 'average' column of co2_mm_mlo.csv. Includes the seasonal cycle; the deseasonalized value and the number of days with data are kept in metadata. Months NOAA interpolated, and Scripps-era months with no day count, carry negative ndays and uncertainty in the file; those flags are kept in metadata. Single-station record filed under the United States as the station's country.

Direction
lower is better
Geography level
station (United States)
Slug
co2-mauna-loa-monthly-mean
Environment & Regeneration

Related metrics

Provenance and methodologysource, series, ingestion, revisions
Classification
Observedpublished by the cited source, ingested without transformation
Source organization
NOAA, NOAA NCEI access data service
Series ID
gml:co2_mm_mlolast fetch: ok
Source links
License and attribution
Approved with attribution
NOAA National Centers for Environmental Information.
Last source update
2026-08-05(source revision label as published by the provider)
Last ingestion
last successful runfresh
Last run
success2026-09-07 20:16 UTC
Parser version
noaa-gml-ncei/1.0.0
Methodology version
1.0
Quality and confidence
Station record, not a national statistic. The most recent year is preliminary pending recalibration of reference gases; NOAA revises it in place and occasionally earlier years. Each revision is stored as a new row labelled with the file creation date. Cite Lan, X., Tans, P. and K.W. Thoning, NOAA Global Monitoring Laboratory (gml.noaa.gov/ccgg/trends/).
Ingestion rejects values outside 250 to 1,000 ppm.
821 periods with values for this geography, 1958-03-01 to 2026-07-01.
Revisions
Values reported for the latest period (2026-07-01) by each source revision ingested. Earlier rows are never deleted; the newest ingested row is shown as current.
Source revisionValue (ppm)Ingested atStatus
2026-08-05429.122026-09-07 20:00 UTCcurrent
No superseded rows for this geography: every period has been ingested once.