Peak methane levels were as high as 3.37 ppm on August 31, 2018, an ominous warning of the threat of destabilization of methane hydrates at the seafloor of the Arctic Ocean.
Mean global methane levels were as high as 1.91 ppm on the morning of September 20, 2018, at 293 millibar.
This is a level unprecedented in human history and it far exceeds the WMO-data-based trend (added on the right of above image).
http://arctic-news.blogspot.com/2018/09/looking-the-climate-abyss-in-the-eye.html
