Previous Activity 4: Keeling's Data, 1970-76*

Month:

1970

1971

1972

1973

1974

1975

1976

January

325.03

326.17

326.77

328.54

329.35

330.40

331.74

February

325.99

326.68

327.63

329.56

330.71

331.41

332.56

March

326.87

327.18

327.75

330.30

331.48

332.04

333.50

April

328.13

327.78

329.72

331.50

332.65

333.31

334.58

May

328.07

328.92

330.07

332.48

333.09

333.97

334.87

June

327.66

328.57

329.09

332.07

332.25

333.60

334.34

July

326.35

327.34

328.05

330.87

331.18

331.91

333.05

August

324.69

325.46

326.32

329.31

329.40

330.06

330.94

September

323.10

323.36

324.93

327.51

327.43

328.56

329.30

October

323.16

323.56

325.06

327.18

327.37

328.34

328.94

November

323.98

324.80

326.50

328.16

328.46

329.49

330.31

December

325.13

326.01

327.55

328.64

329.57

330.76

331.68

*monthly average concentrations of atmospheric carbon dioxide (ppm) at Mauna Loa

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