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Carbon dioxide (CO₂) in 1980 (global mean)
Annual mean338.91 ppm
vs previous year+2.06 ppm
Rank of increase20 / 46
Max − min within year3.39 ppm
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 338.58 ppm | +2.02 |
| Feb | 339.26 ppm | +1.97 |
| Mar | 339.60 ppm | +1.72 |
| Apr | 340.00 ppm | +1.68 |
| May | 340.44 ppm | +2.18 |
| Jun | 339.99 ppm | +2.61 |
| Jul | 338.44 ppm | +2.88 |
| Aug | 337.22 ppm | +2.86 |
| Sep | 337.05 ppm | +2.03 |
| Oct | 337.82 ppm | +1.46 |
| Nov | 338.93 ppm | +1.57 |
| Dec | 339.63 ppm | +1.74 |
+2.06 ppm
+1.19 ppm
+0.75 ppm
+1.67 ppm
+1.54 ppm
+1.46 ppm
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.