Governing Law and Regulations
Indiana Department of Environmental Management (IDEM) Office of Air Quality (OAQ)
See ADDRESSES & CONTACTS for addresses and telephone numbers.
See national section for basic information and federal regulations.
Comparison: State vs. Federal
• Rules. Indiana has adopted by reference the federal NSPS and the NESHAPs, which contain source-specific standards for the control of fugitive emissions. In addition, IDEM has developed its own regulations for the control of fugitive particulate emissions and visible emissions.
• Administration and enforcement. IDEM's OAQ is responsible for the administration and enforcement of the state's fugitive air emissions rules.
FUGITIVE DUST REQUIREMENTS
326 IAC 6-4-2 and 326 IAC 6-4-4
No source in the state of Indiana is allowed to emit fugitive dust that results in one of the following situations:
- Fugitive dust concentrations greater than 67 percent above the upwind ambient concentrations, as determined by the equation in 326 IAC 6-4-2(1). However, if the fugitive dust is composed of 50 percent or greater respirable dust (between 0.5 and 6.0 microns), then the allowable concentration above the upwind ambient concentration must not be greater than the value ...