H2S Exposure Limits in Oil & Gas: PEL, STEL, IDLH and Why Workers Cannot Rely on Smell
Every experienced wellsite worker has heard the same training mantra: “if you can smell it, you’ve already been exposed; if you can’t smell it anymore, you’re about to die.” It is memorable, it is roughly correct, and it is also the single most dangerous oversimplification in upstream and midstream safety
June 19, 2026