Highest levels of methane recorded in history at Mauna Loa, Hawaii

Atmospheric methane update July 2017. NOAA data used.

Equatorial Levels at Mauna Loa, Hawaii represent the highest July readings in recorded history at 1850 ppb.

Arctic Levels at Barrow, Alaska are around 1920 ppb and are likely to equal last

year's historic levels.

Note that methane levels always decline during the Northern Hemisphere summer, but the overall direction is up.

Data sources are:

Mauna Loa:

Barrow:

(CH4, In situ data for both)

I have updated the Wikipedia pages on Atmospheric Methane and Arctic Methane Emissions.

and

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