The Texas Tribune on MSN6mon
Study finds levels of a dangerous gas “off the scales” in Central Texas oilfield
Hydrogen sulfide concentrations at 13 of the wells were at least 300 parts per million (ppm) — the maximum reading on the ...
朝日新聞社3d
‘Guardians’ of hot spring water put lives on the line in winter
Hydrogen sulfide of 5 parts per million (ppm) or higher concentrations was detected at the site. The three had left the hotel the previous day to take care of a hot spring source in the mountains.