Iowa Admin. Code rr. 567-22.11
The state of Iowa ambient air quality standards shall be the National Primary and Secondary Ambient Air Quality Standards as published in 40 CFR Part 50 (1972) and as amended at 38 Federal Register (FR) 22384 (September 14, 1973), 43 FR 46258 (October 5, 1978), 44 FR 8202, 8220 (February 9, 1979), 52 FR 24634-24669 (July 1, 1987), 62 FR 38651-38760, 38855-38896 (July 18, 1997), 71 FR 61144-61233 (October 17, 2006), 73 FR 16436-16514 (March 27, 2008), 73 FR 66964-67062 (November 12, 2008), 75 FR 6474-6537 (February 9, 2010), 75 FR 35520-35603 (June 22, 2010), 78 FR 3086-3287 (January 15, 2013), and 80 FR 65291-65468 (October 26, 2015). The department shall implement these rules in a time frame and schedule consistent with implementation schedules in federal laws and regulations.
Iowa Admin. Code rr. 567-22.11