Title 42 › Chapter CHAPTER 85— - AIR POLLUTION PREVENTION AND CONTROL › Subchapter SUBCHAPTER I— - PROGRAMS AND ACTIVITIES › Part Part C— - Prevention of Significant Deterioration of Air Quality › Subpart subpart i— - clean air › § 7475
You cannot build a major pollution‑producing plant that starts construction after August 7, 1977 in areas covered by this law unless you get a permit that sets emission limits and meets several requirements. The permit process must include an air‑quality analysis, a public hearing, and a finding that the plant won’t cause or add to pollution beyond allowed increases, national air standards, or other limits. The plant must use the best available control technology, protect highly‑protected federal lands (class I areas), include an analysis of air quality impacts from local growth, and the owner must agree to any needed air monitoring. For some projects in class III areas that would affect class II limits, the EPA Administrator must approve the chosen technology. States must send each major permit application to the EPA and tell the Federal Land Manager and the federal official who manages any nearby class I lands. Those federal officials must help protect air‑quality values (including visibility) and can block a permit unless the owner shows particulate matter and sulfur dioxide will not exceed class I limits. If the Federal Land Manager certifies no adverse impact, a permit may be issued but the permit must meet specific maximum allowable increases: particulate matter — annual 19 µg/m3 and 24‑hour 37 µg/m3; sulfur dioxide — annual 20 µg/m3, 24‑hour 91 µg/m3, 3‑hour 325 µg/m3. A governor can grant a special short‑term variance for certain sulfur dioxide limits after a hearing, subject to possible Presidential review within 90 days; such variances carry alternate limits (low terrain 24‑hr 36 µg/m3 and 3‑hr 130 µg/m3; high terrain 24‑hr 62 µg/m3 and 3‑hr 221 µg/m3) and limits on how often 24‑hour exceedances may occur. Completed permit applications must be approved or denied within one year. The required air‑quality analysis must include up to one year of continuous monitoring data (unless the State allows a shorter period), must be ready by the public hearing, and the EPA had to issue rules for how to do these analyses within six months after August 7, 1977. High terrain area: land 900 feet or more above the stack base. Low terrain area: any other land.
Full Legal Text
The Public Health and Welfare — Source: USLM XML via OLRC
Legislative History
Reference
Citation
42 U.S.C. § 7475
Title 42 — The Public Health and Welfare
Last Updated
Apr 6, 2026
Release point: 119-73