(a) In accordance with CAA section 181(a)(1), each area designated nonattainment for the 2008 ozone NAAQS shall be classified by operation of law at the time of designation. The classification shall be based on the 8-hour design value for the area at the time of designation, in accordance with Table 1 below. A state may request a higher or lower classification as provided in paragraphs (b) and (c) of this section. For each area classified under this section, the attainment date for the 2008 NAAQS shall be as expeditious as practicable but not later than the date provided in Table 1 as follows:
Table 1--Classifications and Attainment Dates for 2008 8-Hour Ozone NAAQS (0.075 PPM) for Areas Subject to CFR
Section 51.1102----------------------------------------------------------------------------------------------------------------
Primary standard
attainment date
8-hour design (years after the
Area class value (ppm effective date of
ozone) designation for
2008 primary
NAAQS)----------------------------------------------------------------------------------------------------------------Marginal.................................... from........................... 0.076 3
up to*......................... 0.086Moderate.................................... from........................... 0.086 6
up to*......................... 0.100Serious..................................... from........................... 0.100 9
up to*......................... 0.113Severe-15................................... from........................... 0.113 15
up to*......................... 0.119Severe-17................................... from........................... 0.119 17
up to*......................... 0.175
Extreme..................................... equal to or above.............. 0.175 20----------------------------------------------------------------------------------------------------------------* But not including
(b) A state may request, and the Administrator must approve, a higher classification for any reason in accordance with CAA section 181(b)(3).
(c) A state may request, and the Administrator may in the Administrator's discretion approve, a higher or lower classification in accordance with CAA section 181(a)(4).
(d) The following nonattainment areas are reclassified for the 2008 ozone NAAQS as follows: Serious--Ventura County, CA; Severe--Los Angeles-San Bernardino Counties (West Mojave Desert), Riverside County (Coachella Valley), and Sacramento Metro, CA; Extreme--Los Angeles-South Coast Air Basin, and San Joaquin Valley, CA. [77 FR 30170, May 21, 2012, as amended at 80 FR 12313, Mar. 6, 2015] Sec. 51.1104 [Reserved]