Latest Daily CO₂

Mauna Loa Observatory  |  Atmospheric CO₂ Concentrations

Dec. 5, 2019	410.45 ppm	NOAA-ESRL
Dec. 5, 2018	408.44 ppm	NOAA-ESRL

daily mean concentrations  |  ppm = parts per million

 

RECORDS AS OF DECEMBER 5, 2019
MAUNA LOA OBSERVATORY, HAWAII

All-Time Record Highs for CO2 Daily Averages

 

415.70 ppm on May 15, 2019 (Scripps)
415.64 ppm on May 15, 2019 (NOAA-ESRL)
415.50 ppm on May 13, 2019 (Scripps)
415.40 ppm on May 13, 2019 (NOAA-ESRL)
415.39 ppm on May 12, 2019 (Scripps)
415.27 ppm on May 12, 2019 (NOAA-ESRL)
415.26 ppm on May 11, 2019 (Scripps)
414.94 ppm on May 1, 2019 (Scripps)
414.88 ppm on May 1, 2019 (NOAA-ESRL)
414.84 ppm on March 18, 2019 (NOAA-ESRL) & May 2, 2019 (Scripps) 

Correction of the May 4 2019 Post re: Record CO2 level above 415 ppm
CO2.Earth Facebook Correction | @CO2_Earth Twitter Correction  | @Keeling_Curve Twitter Correction

  

Yearly Records for CO2 Daily Averages

Annual Records Since 2015

2019 (so far)

415.70 ppm on May 15 (Scripps)
415.64 ppm on May 15 (NOAA-ESRL)
415.50 ppm on May 13 (Scripps)
415.40 ppm on May 13 (NOAA-ESRL)
415.39 ppm on May 12 (Scripps)
415.27 ppm on May 12 (NOAA-ESRL)
415.26 ppm on May 11 (Scripps)
414.94 ppm on May 1 (Scripps)
414.88 ppm on May 1 (NOAA-ESRL)
414.84 ppm on March 18  (NOAA-ESRL) & May 2 (Scripps)

2018

 412.60 ppm on May 14 (Scripps)
412.45 ppm on May 14 (NOAA-ESRL)
412.37 ppm on April 23 (NOAA-ESRL)

2017

412.63 ppm on April 26 (NOAA-ESRL)
411.27 ppm on May 15 (NOAA-ESRL)

2016

409.44 ppm on April 9 (Scripps)
409.39 ppm on April 8 (Scripps)

2015

404.84 ppm on April 13 (Scripps)

 

When available, daily average values for carbon dioxide in the atmosphere are posted here as a year-over-year comparison.  Measurements are made by two independent CO₂ monitoring programs (NOAA and Scripps) at the Mauna Loa Observatory in Hawaii, about 3400 metres above sea level.

CO₂.Earth presents a year-over-year comparison of recent daily readings for public education purposes.  Tracking these readings can provide opportunities for in-the-moment learning about the seasonal cycle and trend for atmospheric CO₂.  See the "notes" tab on this page for important information about the daily CO₂ data reposted here.

 

Explore the tabs below to view visuals and links associated with the latest CO₂ readings from Mauna Loa.

 

 

Latest Daily CO₂

Mauna Loa Observatory  |  Atmospheric CO₂ Concentrations

Dec. 5, 2019	410.45 ppm	NOAA-ESRL
Dec. 5, 2018	408.44 ppm	NOAA-ESRL

daily mean concentrations  |  ppm = parts per million

 

RECORDS AS OF DECEMBER 5, 2019
MAUNA LOA OBSERVATORY, HAWAII

All-Time Record Highs for CO2 Daily Averages

 

415.70 ppm on May 15, 2019 (Scripps)
415.64 ppm on May 15, 2019 (NOAA-ESRL)
415.50 ppm on May 13, 2019 (Scripps)
415.40 ppm on May 13, 2019 (NOAA-ESRL)
415.39 ppm on May 12, 2019 (Scripps)
415.27 ppm on May 12, 2019 (NOAA-ESRL)
415.26 ppm on May 11, 2019 (Scripps)
414.94 ppm on May 1, 2019 (Scripps)
414.88 ppm on May 1, 2019 (NOAA-ESRL)
414.84 ppm on March 18, 2019 (NOAA-ESRL) & May 2, 2019 (Scripps) 

Correction of the May 4 2019 Post re: Record CO2 level above 415 ppm
CO2.Earth Facebook Correction | @CO2_Earth Twitter Correction  | @Keeling_Curve Twitter Correction

  

Yearly Records for CO2 Daily Averages

Annual Records Since 2015

2019 (so far)

415.70 ppm on May 15 (Scripps)
415.64 ppm on May 15 (NOAA-ESRL)
415.50 ppm on May 13 (Scripps)
415.40 ppm on May 13 (NOAA-ESRL)
415.39 ppm on May 12 (Scripps)
415.27 ppm on May 12 (NOAA-ESRL)
415.26 ppm on May 11 (Scripps)
414.94 ppm on May 1 (Scripps)
414.88 ppm on May 1 (NOAA-ESRL)
414.84 ppm on March 18  (NOAA-ESRL) & May 2 (Scripps)

2018

 412.60 ppm on May 14 (Scripps)
412.45 ppm on May 14 (NOAA-ESRL)
412.37 ppm on April 23 (NOAA-ESRL)

2017

412.63 ppm on April 26 (NOAA-ESRL)
411.27 ppm on May 15 (NOAA-ESRL)

2016

409.44 ppm on April 9 (Scripps)
409.39 ppm on April 8 (Scripps)

2015

404.84 ppm on April 13 (Scripps)

 

When available, daily average values for carbon dioxide in the atmosphere are posted here as a year-over-year comparison.  Measurements are made by two independent CO₂ monitoring programs (NOAA and Scripps) at the Mauna Loa Observatory in Hawaii, about 3400 metres above sea level.

CO₂.Earth presents a year-over-year comparison of recent daily readings for public education purposes.  Tracking these readings can provide opportunities for in-the-moment learning about the seasonal cycle and trend for atmospheric CO₂.  See the "notes" tab on this page for important information about the daily CO₂ data reposted here.

 

Explore the tabs below to view visuals and links associated with the latest CO₂ readings from Mauna Loa.

 

Scripps

Scripps Hourly & Daily CO₂

 

This Scripps graphic shows hourly CO₂ averages with small grey dots, and daily averages with larger black dots.

One Week   |   One Month   |   One Year   |   Two Years   |   Record Since 1958   |   Since 1700   |   800,000 Years

Source Graphics: Scripps Keeling Curve Website

Scripps reports daily averages based on Mauna Loa local time.

 

 

NOAA

NOAA Daily & Weekly CO₂

 

This NOAA graphic shows daily CO₂ averages with black dots, weekly CO₂ averages with red lines (Sunday to Saturday) and monthly CO₂ averages with blue lines.

 

 Source Graphic:   NOAA Weekly Mauna Loa Web Page

NOAA reports daily averages based on local time in Boulder, Colorado.

 

 

Notes

Notes

 

Scientists compute daily averages from selected hourly values that meet defined standards. Daily averages are used to calculate weekly and monthly averages.

The daily CO2 report at CO2.Earth uses data collected at the same location, the Mauna Loa Observatory, by two indepedent CO2 monitoriing programs.  NOAA-ESRL has monitored CO2 at MLO since 1974 and now runs the facility.  The Scripps Institution of Oceanography started monitoring at MLO in 1958 and continues to monitor CO2 from this site.  Scripps reports daily averages based on local time in Hawaii, USA, where the monitoring station is located.  NOAA reports daily averages based on local time in Boulder, Colorodo, USA where its headquarters is located for a global network of stations that monitor atmospheric levels for CO2 and other greenhouse gases.

Daily averages of CO2 readings are preliminary and subject to data quality checks and adjustments by scientists.   CO₂.Earth presents year-over-year comparisons using the latest available data.  This may include data collected by two different CO2 monitoring stations.  This comparison may be considered of value for public education purposes.  However, it does not reflect scientific practices and any conclusions about long-term trends for atmospheric CO2 should be based on longer-term, more precise data comparisons that are available.

 

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More Data

 

Mauna Loa CO₂

 

CO₂.Earth  Daily CO₂ Data

CO₂.Earth  Weekly CO₂ Data

CO₂.Earth  Monthly CO₂ Data

CO₂.Earth  Yearly CO₂ Data

CO₂.Earth  CO₂ Trend

 

About the Data

 

NOAA  How scientists measure background CO2 levels on Mauna Loa

 

Data Updates

 

Tables at CO2.Earth are updated manually.  If you notice an inconsistency with the source data, give us a nudge.

 

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