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 Oklahoma Administrative Code (Last Updated: March 11, 2021)
 TITLE 252. Department of Environmental Quality
 Chapter 100. Air Pollution Control
 Subchapter 3. Air Quality Standards and Increments

  SECTION 252:100-3-4. Significant deterioration increments

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  • (a)   Significant deterioration, as used in the phrase Prevention of Significant Deterioration (PSD), means an increase in ambient air pollution above a baseline plus a specific increment allowed for one of three classes of areas. See OAC 252:100-8, Part 7.
    (b)   The allowable increments are as follows:
    (1)   Class I Areas:
    (A)   PM2.5 (effective October 20, 2011):
    (i)   annual arithmetic mean: maximum allowable increase is 1 microgram per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 2 micrograms per cubic meter.
    (B)   PM10:
    (i)   annual arithmetic mean: maximum allowable increase is 4 micrograms per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 8 micrograms per cubic meter.
    (C)   Sulfur dioxide:
    (i)   annual arithmetic mean: maximum allowable increase is 2 micrograms per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 5 micrograms per cubic meter.
    (iii)   three-hour maximum: maximum allowable increase is 25 micrograms per cubic meter.
    (D)   Nitrogen dioxide (effective May 11, 1991), annual arithmetic mean: maximum allowable increase is 2.5 micrograms per cubic meter.
    (2)   Class II Areas:
    (A)   PM2.5 (effective October 20, 2011):
    (i)   annual arithmetic mean: maximum allowable increase is 4 micrograms per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 9 micrograms per cubic meter.
    (B)   PM10:
    (i)   annual arithmetic mean: maximum allowable increase is 17 micrograms per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 30 micrograms per cubic meter.
    (C)   Sulfur dioxide:
    (i)   annual arithmetic mean: maximum allowable increase is 20 micrograms per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 91 micrograms per cubic meter.
    (iii)   three-hour maximum: maximum allowable increase is 512 micrograms per cubic meter.
    (D)   Nitrogen dioxide (effective May 11, 1991), annual arithmetic mean: maximum allowable increase is 25 micrograms per cubic meter.
    (3)   Class III Areas:
    (A)   PM2.5 (effective October 20, 2011):
    (i)   annual arithmetic mean: maximum allowable increase is 8 micrograms per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 18 micrograms per cubic meter.
    (B)   PM10:
    (i)   annual arithmetic mean: maximum allowable increase is 34 micrograms per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 60 micrograms per cubic meter.
    (C)   Sulfur dioxide:
    (i)   annual arithmetic mean: maximum allowable increase is 40 micrograms per cubic meter.
    (ii)   twenty-four hour maximum: maximum allowable increase is 182 micrograms per cubic meter.
    (iii)   three-hour maximum: maximum allowable increase is 700 micrograms per cubic meter.
    (D)   Nitrogen dioxide (effective May 11, 1991), annual arithmetic mean: maximum allowable increase is 50 micrograms per cubic meter.
[Source: Added at 11 Ok Reg 977, eff 1-14-94 (emergency); Added at 11 Ok Reg 2031, eff 5-26-94; Amended at 13 Ok Reg 885, eff 11-4-95 (emergency); Amended at 13 Ok Reg 1917, eff 7-1-96; Amended at 22 Ok Reg 1107, eff 6-15-05; Amended at 28 Ok Reg 1179, eff 7-1-11]