Previous Activity 4: Keeling's Data, 1965-1969*

Month:

1965

1966

1967

1968

1969

January

316.25

316.84

318.13

318.60

320.08

February

317.32

317.82

318.54

319.16

320.85

March

317.80

318.69

318.99

319.91

321.90

April

318.92

319.83

320.45

320.89

322.82

May

318.96

320.09

320.89

321.46

323.46

June

318.80

319.81

319.91

321.40

322.76

July

318.15

318.90

318.67

320.00

321.89

August

315.80

316.31

317.09

317.98

319.61

September

314.68

314.52

315.46

316.57

318.56

October

314.39

314.17

315.36

316.27

318.03

November

315.81

315.95

316.75

317.17

318.94

December

316.92

317.07

318.06

318.65

320.35

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

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