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Carbon dioxide (CO₂) in 2018 (global mean)
Annual mean407.61 ppm
vs previous year+2.39 ppm
Rank of increase9 / 46
Max − min within year4.08 ppm
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 407.53 ppm | +2.20 |
| Feb | 408.23 ppm | +2.32 |
| Mar | 408.77 ppm | +2.45 |
| Apr | 409.07 ppm | +2.47 |
| May | 408.94 ppm | +2.30 |
| Jun | 408.06 ppm | +2.21 |
| Jul | 406.48 ppm | +2.37 |
| Aug | 405.11 ppm | +2.54 |
| Sep | 405.18 ppm | +2.52 |
| Oct | 406.65 ppm | +2.49 |
| Nov | 408.13 ppm | +2.43 |
| Dec | 409.19 ppm | +2.44 |
+2.75 ppm
+1.95 ppm
+2.31 ppm
+3.42 ppm
+2.15 ppm
+2.39 ppm
+2.46 ppm
+2.37 ppm
+2.26 ppm
+2.38 ppm
+2.27 ppm
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.