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Carbon dioxide (CO₂) in 1988 (global mean)
Annual mean351.16 ppm
vs previous year+2.48 ppm
Rank of increase7 / 46
Max − min within year3.36 ppm
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 350.91 ppm | +2.90 |
| Feb | 351.47 ppm | +2.91 |
| Mar | 351.85 ppm | +2.57 |
| Apr | 352.29 ppm | +2.31 |
| May | 352.46 ppm | +2.20 |
| Jun | 351.76 ppm | +2.30 |
| Jul | 350.28 ppm | +2.44 |
| Aug | 349.10 ppm | +2.49 |
| Sep | 349.27 ppm | +2.57 |
| Oct | 350.44 ppm | +2.47 |
| Nov | 351.61 ppm | +2.36 |
| Dec | 352.46 ppm | +2.25 |
+1.67 ppm
+1.54 ppm
+1.46 ppm
+1.43 ppm
+1.71 ppm
+2.48 ppm
+1.63 ppm
+1.27 ppm
+1.34 ppm
+0.70 ppm
+0.74 ppm
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.