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Carbon dioxide (CO₂) in 1991 (global mean)
Annual mean355.40 ppm
vs previous year+1.34 ppm
Rank of increase39 / 46
Max − min within year4.26 ppm
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 355.76 ppm | +1.28 |
| Feb | 356.19 ppm | +1.32 |
| Mar | 356.69 ppm | +1.49 |
| Apr | 357.19 ppm | +1.68 |
| May | 357.11 ppm | +1.70 |
| Jun | 356.18 ppm | +1.86 |
| Jul | 354.53 ppm | +1.83 |
| Aug | 353.06 ppm | +1.48 |
| Sep | 352.93 ppm | +1.14 |
| Oct | 354.01 ppm | +0.82 |
| Nov | 355.16 ppm | +0.71 |
| Dec | 355.95 ppm | +0.76 |
+1.43 ppm
+1.71 ppm
+2.48 ppm
+1.63 ppm
+1.27 ppm
+1.34 ppm
+0.70 ppm
+0.74 ppm
+1.49 ppm
+1.85 ppm
+1.76 ppm
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.