Regional Haze and Best Available Retrofit Technology (BART) Archive

On July 1, 1999, U.S. EPA published a final rule to address a visibility impairment known as regional haze (64 FR 35714). The regional haze rule requires states to submit state implementation plans (SIPs) to address regional haze visibility impairment in 156 Federally- protected parks and wilderness areas, referred to as Class I areas. Also included is a requirement for installation of best available retrofit technology (BART) at certain large stationary sources. BART is required for any source that is determined to emit air pollutants that may reasonably be anticipated to cause or contribute to visibility impairment in a Class I area. The BART guidelines were published on July 6, 2005 (70 FR 39104).

Although there are no Class I areas in Indiana, there are several in the region that may be affected by emissions from Indiana sources. The BART guidelines provide the mechanism for complying with the requirement to address visibility impairment in Class I areas. IDEM was obligated to submit the regional haze SIP by December 17, 2007, including a commitment that BART would be implemented in accordance with the federal guidelines.

Work Group Objectives

The Regional Haze and BART Work Group consisted of representatives of companies, trade organizations, consulting firms, law firms, and environmentalists interested in the BART rulemaking and regional haze SIP effort. This group met as needed for dissemination and discussion of information on the BART rulemaking and Regional Haze SIP effort.


Modeling Information

BART Rulemaking

Regional Haze State Implementation Plan Submittal

Updated with Supplements 03/10/2011


Regional Haze Rule Contacts

  • Christine Pedersen: IDEM contact
  • Mark Derf: Modeling protocols and information contact

If you would like more information about the Regional Haze and BART workgroup, please contact