Section 096-110-4 - Carbon Monoxide Ambient Air Quality StandardsThe ambient air quality standards for carbon monoxide are:
A.9 ppm (10 milligrams per cubic meter) for an 8-hour average concentration.The 8-hour average is met when the second-highest 8-hour average concentration per calendar year, as determined in accordance with 40 CFR Part 50 Appendix C, is less than or equal to 9 ppm; andB.35 ppm (40 milligrams per cubic meter) for an 1-hour average.The 1-hour average is met when the second-highest 1-hour average concentration per calendar year, as determined in accordance with 40 CFR Part 50 Appendix C, is less than or equal to 35 ppm.06- 096 C.M.R. ch. 110, § 4