Indiana rules related to air pollution are contained within Title 326 of the Indiana Administrative Code (IAC). Articles 14 and 20 of Title 326 deal specifically with Hazardous Air Pollutants and their federal emissions standards. Rules for HAPs often refer to and regulate specific industries or industrial processes. These types of rules are generally based on federal standards called NESHAPs (National Emissions Standards for Hazardous Air Pollutants). If Indiana agrees to be responsible for enforcing a NESHAP (referred to as accepting delegation) then a state rule must be adopted. IDEM currently has accepted delegation of 111 NESHAPs.
HAPs are covered by other rules as well. For example, portions of 326 IAC 11 place limits on certain HAPs emissions, specifically those from various types of incinerators. 326 IAC 2-2 (Prevention of Significant Deterioration) and 326 IAC 2-3 (New Source Review) also regulates new sources or modifications of emission units that emit certain toxics, such as lead, beryllium, mercury, vinyl chloride, and fluorides.
In addition to rules that regulate emissions from various industrial sources, IDEM also has the authority to require sources to provide additional information about their emissions to the air as part of 326 IAC 2-6. Specifically subsection 2-6-5 allows IDEM to request additional emissions information to aid in completion of specific projects. This subsection of the rule is not often needed, but can be used to help aid IDEM in conducting more detailed emissions analysis resulting from local or federal concerns or regulations.
More information about IDEM Air Pollution Control rules can be found on the IDEM Legal Counsel: Rulemaking page.