Highest levels of methane recorded in history at Mauna Loa, Hawaii
Atmospheric methane update July 2017. NOAA data used.
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:
(CH4, In situ data for both)
I have updated the Wikipedia pages on Atmospheric Methane and Arctic Methane Emissions.