Okla. Admin. Code § 252:100-3-4

Current through Vol. 42, No. 8, January 2, 2025

Section 252:100-3-4 - Significant deterioration increments

(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.

Okla. Admin. Code § 252:100-3-4

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