8 CAR pt. 41, Appendix B. National Ambient Air Quality Standards List

ARKANSAS POLLUTION CONTROL AND ECOLOGY COMMISSION 8 CAR pt. 41 APPENDIX B NATIONAL AMBIENT AIR QUALITY STANDARDS LIST APPENDIX B: NATIONAL AMBIENT AIR QUALITY STANDARDS LIST The national ambient air quality standards as adopted as of the effective date of this Rule are listed below. Pollutant Final Rule Cite Final Rule Date Primary / Secondary Averaging Time Level Form Applicable Chapters Carbon Monoxide 76 FR 54294 August 31, 2011 Primary Eight-hour Nine (9) parts per million Not to be exceeded more than once per year All Chapters One-hour Thirty- five (35) parts per million All Chapters Lead 73 FR 66964 November 12, 2008 Primary and secondary Rolling three- month average 0.15 microgra ms per cubic meter Not to be exceeded All Chapters Nitrogen Dioxide 75 FR 6474 February 9, 2010 Primary One-hour One hundre d (100 ) parts per billion Ninety-eighth (98th) percentile, averaged over three (3) years All Chapters 61 FR 52852 October 8, 1996 Primary and secondary Annual Fifty- three (53) parts per billion Annual Mean All Chapters Pollutant Final Rule Cite Final Rule Date Primary / Secondary Averaging Time Level Form Applicable Chapters Ozone 80 FR 65292 October 26, 2015 Primary and secondary Eight-hour 0.070 parts per million Annual fourth- highest daily maximum eight- hour concentration, averaged over three (3) years All Chapters Particle Pollution, PM2.5 78 FR 3085 January 15, 2013 Primary Annual Twelve (12) microgra ms per cubic meter Annual mean, averaged over three (3) years All Chapters 71 FR 61144 October 17, 2006 Secondary Annual Fifteen (15) microgra ms per cubic meter Primary and secondary Twenty- four- hour Thirty- five (35) microgra ms per cubic meter Ninety-eighth (98th) percentile, averaged over three (3) years All Chapters Pollutant Final Rule Cite Final Rule Date Primary / Secondary Averaging Time Level Form Applicable Chapters Particle Pollution, PM10 71 FR 61144 October 17, 2006 Primary and secondary Twenty- four- hour One- hundre d fifty (150) microgra ms per cubic meter Not to be exceeded more than once per year on average over three (3) years All Chapters Sulfur Dioxide 75 FR 35520 June 22, 2010 Primary One-hour Seventy- five (75) parts per billion Ninety-ninth (99th) percentile of one- hour daily maximum concentrations, averaged over three (3) years All Chapters 38 FR 25678 September 14, 1973 Secondary Three-hour 0.5 parts per million Not to be exceeded more than once per year All Chapters