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Carbon dioxide (CO₂) in 1981 (global mean)
Annual mean340.11 ppm
vs previous year+1.19 ppm
Rank of increase41 / 46
Max − min within year3.71 ppm
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 340.18 ppm | +1.60 |
| Feb | 340.75 ppm | +1.49 |
| Mar | 341.38 ppm | +1.78 |
| Apr | 341.68 ppm | +1.68 |
| May | 341.43 ppm | +0.99 |
| Jun | 340.63 ppm | +0.64 |
| Jul | 339.22 ppm | +0.78 |
| Aug | 338.08 ppm | +0.86 |
| Sep | 337.97 ppm | +0.92 |
| Oct | 339.07 ppm | +1.25 |
| Nov | 340.17 ppm | +1.24 |
| Dec | 340.74 ppm | +1.11 |
+2.06 ppm
+1.19 ppm
+0.75 ppm
+1.67 ppm
+1.54 ppm
+1.46 ppm
+1.43 ppm
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.