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Methane (CH₄) in 1988 (global mean)
Annual mean1,693.3 ppb
vs previous year+10.5 ppb
Rank of increase11 / 41
Max − min within year16.8 ppb
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 1,692.0 ppb | +12.5 |
| Feb | 1,692.5 ppb | +13.5 |
| Mar | 1,691.3 ppb | +11.3 |
| Apr | 1,690.1 ppb | +8.7 |
| May | 1,689.1 ppb | +7.2 |
| Jun | 1,687.2 ppb | +7.2 |
| Jul | 1,686.0 ppb | +10.0 |
| Aug | 1,689.5 ppb | +12.2 |
| Sep | 1,696.1 ppb | +10.5 |
| Oct | 1,701.1 ppb | +9.6 |
| Nov | 1,702.8 ppb | +11.6 |
| Dec | 1,701.9 ppb | +11.4 |
+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
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.