Mine safety regulators will stop measuring diesel exhaust in underground mines
What happened
US mine safety regulators want to remove rules that limit how much diesel exhaust miners can breathe. They say this will make rules simpler for mine operators, but still keep miners safe.
Why it matters
For years, regulators have tried to limit how much diesel exhaust miners breathe, because it causes lung disease and cancer. This proposal removes the specific measurement requirements for diesel particulate matter, which is the main way they track exposure. It means mine operators will no longer have to prove they are meeting specific limits for this pollutant.
The signal
Watch for public comments on this proposed rule, especially from miner advocacy groups and health organizations, to see if they challenge the claim that safety will be maintained.