StacksVerified U.S. regulatory reference

40 CFR §51.1117

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
For each area classified as Severe or Extreme for the 2008 ozone NAAQS, the state shall submit a SIP revision within 10 years of the effective date of designation that meets the requirements of CAA section 185.