These guys claim they found a coalbed methane deposit that was 6% carbon monoxide. If true, that would be rapidly fatal if it leaked into a mine. https://www.re

These guys claim they found a coalbed methane deposit that was 6% carbon monoxide. If true, that would be rapidly fatal if it leaked into a mine. https://www.researchgate.net/figure/Composition-and-calorific-value-of-coalbed-methane-in-different-regions_tbl1_339466180 https://www.researchgate.net/figure/Composition-and-calorifi... The firedamp wikipedia article also names "the insidiously lethal afterdamp (carbon monoxide and other gases) which are produced following explosions of firedamp or coal dust." https://en.wikipedia.org/wiki/Firedamp https://en.wikipedia.org/wiki/Firedamp