§ 51.903. How do the classification and attainment date provisions in section 181 of subpart 2 of the CAA apply to areas subject to § 51.902(a)?
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/us/cfr/t40/s§ 51.903·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)In accordance with section 181(a)(1) of the CAA, each area subject to § 51.902(a) shall be classified by operation of law at the time of designation. However, the classification shall be based on the 8-hour design value for the area, in accordance with Table 1 below, or such higher or lower classification as the State may request as provided in paragraphs
(b)and
(c)of this section. The 8-hour design value for the area shall be calculated using the three most recent years of air quality data. For each area classified under this section, the primary NAAQS attainment date for the 8-hour NAAQS shall be as expeditious as practicable but not later than the date provided in the following Table 1. Table 1—Classification for 8-Hour Ozone NAAQS for Areas Subject to § 51.902(a) Area class 8-hour design value (ppm ozone) Maximum period for attainment dates in state plans (years after effective date of nonattainment designation for 8-hour NAAQS) Marginalfrom up to 10.085 0.0923 Moderatefrom up to 10.092 0.1076 Seriousfrom up to 10.107 0.1209 Severe-15from up to 10.120 0.12715 Severe-17from up to 10.127 0.18717 Extremeequal to or above0.18720 1 but not including.
(b)A State may request a higher classification for any reason in accordance with section 181(b)(3) of the CAA.
(c)A State may request a lower classification in accordance with section 181(a)(4) of the CAA.
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§ 51.903
How do the classification and attainment date provisions in section 181 of subpart 2 of the CAA apply to areas subject to § 51.902(a)?
Fed. Reg.×84
C.F.R.×1
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