If these are actually flammable, we could be hit with some ver y big BOOMs!
Sources:
https://www.usatoday.com/story/news/nation/2020/02/03/pa-nj-delaware-investigating-mystery-smell-across-tri-state-area/4643414002/?utm_source=feedblitz&utm_medium=FeedBlitzRss&utm_campaign=usatodaycomnation-topstories
https://www.seas.harvard.edu/climate/eli/research/equable/hadley.html
https://books.google.com/books?hl=en&lr=&id=oUXzCAAAQBAJ&oi=fnd&pg=PR13&dq=gas+bubbles+moving+over+land&ots=h5_5_edpO-&sig=N8B_Hs-UbzT9rtOfMGZf-9R2oF8#v=onepage&q&f=false