• Minor source permitting for NOx and PM2.5 is in effect on January 22, 2013.
  • IDNR released a new construction permit form MD (Modeling Determination), effective January 22, 2013 to address minor source permitting for PM2.5, NO2, and SO2 as well as to streamline when minor source modeling will be required. Additionally, new modeling guidelines for both PSD and minor source modeling have been released along with updated meteorological data files (processed with the December 2012 version of AERMET), and new background concentrations to be used in NAAQS dispersion modeling.
  • 567 IAC Chapter 17 was approved by the Commission on January 15, 2013. This chapter formalizes IDNR's compliance and enforcement policy guidance.