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Methane (CH₄) in 1990 (global mean)
Annual mean1,714.5 ppb
vs previous year+9.9 ppb
Rank of increase14 / 41
Max − min within year17.0 ppb
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 1,712.0 ppb | +11.5 |
| Feb | 1,713.3 ppb | +12.2 |
| Mar | 1,714.2 ppb | +11.7 |
| Apr | 1,712.5 ppb | +8.9 |
| May | 1,710.6 ppb | +7.3 |
| Jun | 1,708.4 ppb | +8.2 |
| Jul | 1,706.5 ppb | +8.3 |
| Aug | 1,710.2 ppb | +8.1 |
| Sep | 1,717.6 ppb | +10.4 |
| Oct | 1,722.2 ppb | +11.6 |
| Nov | 1,723.6 ppb | +10.4 |
| Dec | 1,723.3 ppb | +10.1 |
+12.4 ppb
+12.8 ppb
+12.6 ppb
+10.5 ppb
+11.3 ppb
+9.9 ppb
+10.4 ppb
+10.5 ppb
+1.1 ppb
+5.6 ppb
+6.7 ppb
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.