The Environmental Protection Commission has adopted amendments to Chapter 20, "Scope of Title--Definitions--Forms--Rules of Practice," Chapter 21, "Compliance," Chapter 22, "Controlling Pollution," Chapter 23, "Emission Standards for Contaminants," Chapter 25, "Measurement of Emissions," and Chapter 33, "Special Regulations and Construction Permit Requirements for Major Stationary Sources--Prevention of Significant Deterioration of Air Quality," Iowa Administrative Code. The purpose of the amendments is to update state air quality rules for new state and federal requirements enacted within the last year. The amendments also include corrections, clarifications, and improvements to existing air quality rules, including the rules for construction permits, prevention of fugitive dust, and the opacity limit for incinerators. http://www.legis.state.ia.us/Rules/Current/Bulletin/IAB080507.pdf p. 1659.