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Methane (CH₄) in 1998 (global mean)
Annual mean1,765.7 ppb
vs previous year+11.1 ppb
Rank of increase9 / 41
Max − min within year20.1 ppb
By month
| Month | Concentration | vs same month last year |
|---|---|---|
| Jan | 1,761.5 ppb | +8.1 |
| Feb | 1,761.5 ppb | +7.6 |
| Mar | 1,763.0 ppb | +7.3 |
| Apr | 1,764.7 ppb | +9.2 |
| May | 1,764.3 ppb | +10.5 |
| Jun | 1,760.4 ppb | +10.3 |
| Jul | 1,756.2 ppb | +10.1 |
| Aug | 1,760.2 ppb | +12.5 |
| Sep | 1,770.7 ppb | +15.7 |
| Oct | 1,776.3 ppb | +16.0 |
| Nov | 1,775.6 ppb | +13.8 |
| Dec | 1,774.1 ppb | +12.2 |
+1.1 ppb
+5.6 ppb
+6.7 ppb
+2.4 ppb
+3.3 ppb
+11.1 ppb
+6.7 ppb
+0.9 ppb
-1.9 ppb
+1.4 ppb
+4.6 ppb
Bars: yearly increase in the surrounding years. NOAA GML global monthly means.