CO2 Now

 

What the world needs to watch

Global warming is mainly the result of CO2 levels rising in the Earth’s atmosphere. Both atmospheric CO2 and climate change are accelerating. Climate scientists say we have years, not decades, to stabilize CO2 and other greenhouse gases.

To help the world succeed, CO2Now.org makes it easy to see the most current CO2 level and what it means. So, use this site and keep an eye on CO2.  Invite others to do the same. Then we can do more to send CO2 in the right direction.

Watch CO2 now and know the score on global warming, practically in real time.

Current Data for Atmospheric CO2 PDF Print E-mail


The world's most current data for atmospheric CO2 is from measurements at the Mauna Loa Observatory in Hawaii. These high-precision measurements were started by Dave Keeling (shown in the photo) in March 1958.

Today, the monthly average concentration of CO2 in the atmosphere is published by the National Oceanic and Atmospheric Administration (NOAA) within a week after each month ends.  The source data is organized into a table and republished here at CO2Now.org so more people can see the latest CO2 level and the important CO2 trend.  The table includes the full Mauna Loa instrument record for atmospheric CO2.

NOAA release date for CO2 data:

Wednesday July 7, 2010 (10:15:05)

Atmospheric CO2
Mauna Loa Observatory (Scripps / NOAA / ESRL)
Monthly & Annual Mean CO2 Concentrations (ppm)
March 1958 - Present

 

Year

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Annual

1958

 

 

315.71

317.45

317.5

317.11

315.86

314.93

313.20

312.61

313.33

314.67

 

1959

315.62

316.38

316.71

317.72

318.29

318.16

316.55

314.8

313.84

313.26

314.80

315.59

315.98

1960

316.43

316.97

317.58

319.02

320.02

319.59

318.18

315.91

314.16

313.83

315.00

316.19

316.91

1961

316.93

317.70

318.54

319.48

320.58

319.77

318.58

316.79

314.80

315.38

316.10

317.01

317.64

1962

317.94

318.55

319.68

320.63

321.01

320.55

319.58

317.40

316.26

315.42

316.69

317.70

318.45

1963

318.74

319.08

319.86

321.39

322.24

321.47

319.74

317.77

316.21

315.99

317.12

318.31

318.99

1964

319.57

320.11

320.76

321.79

322.24

321.89

320.44

318.70

316.70

316.79

317.79

318.71

319.62

1965

319.44

320.44

320.89

322.13

322.16

321.87

321.39

318.80

317.81

317.30

318.87

319.42

320.04

1966

320.62

321.59

322.39

323.87

324.01

323.75

322.40

320.37

318.64

318.10

319.78

321.08

321.38

1967

322.06

322.50

323.04

324.42

325.00

324.09

322.55

320.92

319.31

319.31

320.72

321.96

322.16

1968

322.57

323.15

323.89

325.02

325.57

325.36

324.14

322.03

320.41

320.25

321.31

322.84

323.04

1969

324.00

324.42

325.64

326.66

327.34

326.76

325.88

323.67

322.38

321.78

322.85

324.12

324.62

1970

325.03

325.99

326.87

328.14

328.07

327.66

326.35

324.69

323.10

323.16

323.98

325.13

325.68

1971

326.17

326.68

327.18

327.78

328.92

328.57

327.34

325.46

323.36

323.56

324.80

326.01

326.32

1972

326.77

327.63

327.75

329.72

330.07

329.09

328.05

326.32

324.93

325.06

326.50

327.55

327.45

1973

328.55

329.56

330.30

331.50

332.48

332.07

330.87

329.31

327.51

327.18

328.16

328.64

329.68

1974

329.35

330.71

331.48

332.65

333.15

332.13

330.99

329.17

327.41

327.21

328.34

329.50

330.17

1975

330.68

331.41

331.85

333.29

333.91

333.40

331.74

329.88

328.57

328.35

329.33

330.55

331.08

1976

331.66

332.75

333.46

334.78

334.79

334.05

332.95

330.64

328.96

328.77

330.18

331.65

332.05

1977

332.69

333.23

334.97

336.03

336.82

336.10

334.79

332.53

331.19

331.21

332.35

333.47

333.78

1978

335.09

335.26

336.61

337.77

338.00

337.98

336.48

334.37

332.33

332.40

333.76

334.83

335.41

1979

336.21

336.64

338.13

338.96

339.02

339.20

337.60

335.56

333.93

334.12

335.26

336.78

336.78

1980

337.80

338.28

340.04

340.86

341.47

341.26

339.34

337.45

336.10

336.05

337.21

338.29

338.68

1981

339.36

340.51

341.57

342.56

343.01

342.52

340.71

338.51

336.96

337.13

338.58

339.91

340.11

1982

340.92

341.69

342.87

343.83

344.30

343.42

341.85

339.82

337.98

338.09

339.24

340.67

341.22

1983

341.42

342.67

343.45

345.08

345.75

345.32

343.93

342.08

340.00

340.12

341.35

342.89

342.84

1984

343.87

344.59

345.29

346.58

347.36

346.80

345.37

343.06

341.24

341.54

342.90

344.36

344.41

1985

345.08

345.89

347.49

348.02

348.75

348.19

346.49

344.70

343.04

342.92

344.22

345.61

345.87

1986

346.42

346.95

347.88

349.57

350.35

349.70

347.78

345.89

344.88

344.34

345.67

346.89

347.19

1987

348.20

348.55

349.56

351.12

351.84

351.45

349.77

347.62

346.37

346.48

347.80

349.03

348.98

1988

350.23

351.58

352.22

353.53

354.14

353.64

352.53

350.42

348.84

348.94

349.99

351.29

351.45

1989

352.72

353.10

353.64

355.43

355.70

355.11

353.79

351.42

349.83

350.10

351.26

352.66

352.90

1990

353.63

354.72

355.49

356.10

357.08

356.11

354.67

352.67

351.05

351.36

352.81

354.21

354.16

1991

354.87

355.67

357.00

358.40

359.00

357.99

355.96

353.78

352.20

352.22

353.70

354.98

355.48

1992

356.08

356.84

357.73

358.91

359.45

359.19

356.72

354.77

352.80

353.21

354.15

355.39

356.27

1993

356.76

357.17

358.26

359.17

360.07

359.41

357.36

355.29

353.96

354.03

355.27

356.70

356.95

1994

358.05

358.80

359.67

361.13

361.48

360.60

359.20

357.23

355.42

355.89

357.41

358.74

358.64

1995

359.73

360.61

361.60

363.05

363.62

363.03

361.55

358.94

357.93

357.80

359.22

360.42

360.62

1996

361.83

362.94

363.91

364.28

364.93

364.70

363.31

361.15

359.41

359.34

360.62

361.96

362.36

1997

362.81

363.87

364.25

366.02

366.47

365.36

364.10

361.89

360.05

360.49

362.21

364.12

363.47

1998

365.00

365.82

366.95

368.42

369.33

368.78

367.59

365.81

363.83

364.18

365.36

366.87

366.50

1999

367.97

368.83

369.46

370.77

370.66

370.10

369.10

366.70

364.61

365.17

366.51

367.85

368.14

2000

369.07

369.32

370.38

371.63

371.32

371.51

369.69

368.18

366.87

366.94

368.27

369.62

369.40

2001

370.47

371.44

372.39

373.32

373.77

373.13

371.51

369.59

368.12

368.38

369.64

371.11

371.07

2002

372.38

373.08

373.87

374.93

375.58

375.44

373.91

371.77

370.72

370.50

372.19

373.71

373.17

2003

374.92

375.63

376.51

377.75

378.54

378.21

376.65

374.28

373.12

373.10

374.67

375.97

375.78

2004

377.03

377.87

378.88

380.42

380.62

379.66

377.48

376.07

374.10

374.47

376.15

377.51

377.52

2005

378.43

379.70

380.91

382.20

382.45

382.14

380.60

378.60

376.72

376.98

378.29

380.07

379.76

2006

381.36

382.19

382.65

384.65

384.94

384.01

382.15

380.33

378.81

379.06

380.17

381.85

381.85

2007

382.88

383.77

384.42

386.36

386.53

386.01

384.45

381.96

380.81

381.09

382.37

383.84

383.71

2008

385.42

385.72

385.96

387.18

388.50

387.88

386.39

384.15

383.07

382.98

384.11

385.54

385.57

2009

386.92

387.41 

388.77

389.46

390.18

389.43

387.74

385.91 

384.77 

384.38

385.99

387.27 

387.35 

2010

388.55

390.04 

391.15

392.42

 392.94

 392.04

 

 

 

 

 

 

 

Source Data
 

Mauna Loa Monthly Mean CO2

Source data published by the National Oceanic and Atmospheric Administration (NOAA)

Mauna Loa Annual Mean CO2

Source data published by the National Oceanic and Atmospheric Administration (NOAA)

 

Data Notes

  • At CO2Now.org, data for March 1958 - April 1974 was obtained by Charles David Keeling of the Scripps Institution of Oceanography (Scripps).  Data for CO2 since May 1974 was obtained by the National Oceanic and Atmospheric Administration (NOAA).   The Scripps Institution of Oceanography also maintains a CO2 monitoring program at the Mauna Loa Observatory.  Click here to access the Scripps data for the Mauna Loa Observatory.   
    •  
  • Monthly mean CO2 concentrations are determined from daily averages for the number of CO2 molecules in every one million molecules of dried air (water vapor removed).  Annual mean CO2 concentrations are the arithmetic mean of the monthly averages for the year.  Atmospheric CO2 concentrations are expressed as parts per million (ppm).

 

  • NOAA data published within the past year is preliminary and subject to change by NOAA due to its recalibration of the reference gas mixture used or other quality control procedures.  In some cases, data from earlier years may be changed for the same reasons.  Usually, these changes are minor. See the NOAA change log and notes that was started in August 2008 to keep a public record of the adjustments and reasons for the adjustments.   

 

  • All data in this table is republished from the most current data available from NOAA.  Data is republished independently by Pro Oxygen at CO2Now.org to make it easier for people to see the latest atmospheric CO2 data and trend information.  A delay of 4 to 24  hours typically occurs between the release of monthly data by NOAA and the publication of updates at CO2Now.org.   The accuracy of republished data can be checked by reviewing the source data.   In the event that a publication error is detected, please send details to This e-mail address is being protected from spam bots, you need JavaScript enabled to view it .   

 

 

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