The Air Pollution Control Board seeks public comment on changes to 326 Ind. Admin. Code §1.3.4, concerning NAAQS for nitrogen oxide, sulfur dioxide, and particulate matter, and §1.4.1, to add a definition for particulate matter. The deadline for written comment is October 12, 2012, and there will be a public hearing November 7. See http://www.in.gov/legislative/iac/20120912-IR-326120510PHA.xml.html.