US lawIndianaRegulationsTitle 326 — Air Pollution Control DivisionArticle 1 — ARTICLE 1. GENERAL PROVISIONSRule 2 — Definitions1-2-69326 IAC 1-2-69326 IAC 1-2-69 "Respirable dust" definedLast amended: 2026Year: 2027Length: 14 wordsOfficial source Cite as Ind. Admin. Code tit. 326, r. 1-2-69Sec. 69. Particles in the range of 0.5 microns to 6.0 microns in diameter.Previous326 IAC 1-2-68Next326 IAC 1-2-70