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Carbon dioxide (CO₂) in 1983 (global mean)
Annual mean342.53 ppm
vs previous year+1.67 ppm
Rank of increase31 / 46
Max − min within year3.31 ppm
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 342.37 ppm | +1.01 |
| Feb | 342.74 ppm | +0.79 |
| Mar | 343.04 ppm | +0.81 |
| Apr | 343.51 ppm | +0.99 |
| May | 343.84 ppm | +1.47 |
| Jun | 343.50 ppm | +2.01 |
| Jul | 342.14 ppm | +2.39 |
| Aug | 340.62 ppm | +2.51 |
| Sep | 340.53 ppm | +2.37 |
| Oct | 341.75 ppm | +2.14 |
| Nov | 342.83 ppm | +1.88 |
| Dec | 343.49 ppm | +1.72 |
+2.06 ppm
+1.19 ppm
+0.75 ppm
+1.67 ppm
+1.54 ppm
+1.46 ppm
+1.43 ppm
+1.71 ppm
+2.48 ppm
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.