IDEM's Office of Air Quality (OAQ) is Indiana’s Clean Air Act permitting authority. OAQ implements Indiana's air permit rules, which are found in Title 326, Article 2 of the Indiana Administrative Code (326 IAC 2) and incorporate applicable state and federal requirements including:
- Applicable air pollution control rules found at Title 326 of IAC
- Applicable federal regulations including but not limited to:
- The federal Clean Air Act (CAA) (Title 42, Chapter 85 of the U.S. Code, 42 U.S.C. Ch. 85)
- National Ambient Air Quality Standards (NAAQS) (Title 40, Part 50 of the Code of Federal Regulations (40 CFR Part 50))
- New Source Performance Standards (NSPS) for stationary sources (40 CFR Part 60)
- National Emission Standards for Hazardous Air Pollutants (NESHAP) (40 CFR Part 61, and 40 CFR Part 63)
- State operating permit regulations under Title V of the CAA (40 CFR Part 70)
Compliance with Indiana's air permit rules assures that regulated sources of air pollutants will not cause or contribute to violations of the NAAQS or interfere with the goals in Indiana's state implementation plan.
Nonrule Policies
Nonrule policy documents clarify how IDEM will implement and enforce certain rules, particularly those that may be complex or highly technical. Effective and pending nonrule policy documents for the Office of Air Quality are available online.
Please note that the information and guidance provided on this website is intended to help citizens and applicants understand permitting requirements that may be applicable. IDEM issues permitting decisions for each source based on applicable laws and rules. Information and guidance provided on this website does not take the place of applicable federal, state, or local laws or regulations. Applicants are advised to use the laws and rules as their primary reference when determining their permitting requirements. Owners, operators and their representatives are encouraged to contact IDEM for applicant assistance.