5 Colo. Code Regs. § 1001-14-I

Current through Register Vol. 47, No. 24, December 25, 2024

Section 5 CCR 1001-14-I - Ambient Air Quality Standards

I.A. National Ambient Air Quality Standards

For National Ambient Air Quality Standards and associated ambient air monitoring reference methods, see Title 40, CFR Part 50.

I.B. Colorado Ambient Air Quality Standards (State Only)

I.B.1. Sulfur Dioxide (SO2)¹

The actual concentration of sulfur dioxide at any given receptor site (no greater than five meters above ground level) in the State of Colorado shall not exceed a three-hour maximum of 700 micrograms per cubic meter (ug/m3) (or 0.267 parts per million by volume (ppmv) at one atmosphere and 25 degrees Celsius more than once in any twelve-month period.

The analytical methods to be employed for the determination of ambient air concentrations of sulfur dioxide shall be any reference method identified in title 40 CFR, Part 50, Appendix A. Alternative methods may be used listed as a "reference" or "equivalent" method by the U.S. Environmental Protection Agency in accordance with Title 40 CFR, Part 53 . Concentrations shall be reported as micrograms per cubic meter or parts per million referred to a temperature of 25 degrees Celsius and a pressure of one atmosphere (1013 millibars).

¹Sulfur Dioxide: Revised: 3/10/83; Effective 4/30/83. Revised 2/18/10; Effective 3/30/10.

5 CCR 1001-14-I

39 CR 24, December 25, 2016, effective 1/14/2017

44 CR 02, January 25, 2021, effective 2/14/2021

46 CR 02, January 25, 2022, effective 2/14/2023

47 CR 02, January 25, 2024, effective 2/14/2024

47 CR 17, September 10, 2024, effective 10/15/2024