StacksVerified U.S. regulatory reference

30 CFR §72.500

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Each piece of permissible diesel-powered equipment introduced into an underground area of an underground coal mine after May 21, 2001 must emit no more than 2.5 grams per hour of diesel particulate matter.
  2. (b)As of July 19, 2002, each piece of permissible diesel-powered equipment operated in an underground area of an underground coal mine must emit no more than 2.5 grams per hour of diesel particulate matter.