40 C.F.R. § 52.1398

Current through October 31, 2024

Section 52.1398 - Control strategy: Sulfur dioxide

(a)Redesignation to attainment. The EPA has determined that the Billings 2010 sulfur dioxide (SO₂) nonattainment area has met the criteria under CAA section 107(d)(3)(E) for redesignation from nonattainment to attainment for the 2010 1-hour SO₂ NAAQS. The EPA is therefore redesignating the Billings 2010 SO₂ nonattainment area to attainment.

(b) The EPA is approving the maintenance plan for the Billings nonattainment area for the 2010 SO₂ NAAQS submitted by the State of Montana on December 14, 2015.

(c)Redesignation to attainment. The EPA has determined that the East Helena sulfur dioxide (SO₂) nonattainment area has met the criteria under CAA section 107(d)(3)(E) for redesignation from nonattainment to attainment for the 1971 primary and secondary SO₂ NAAQS. The EPA is therefore redesignating the East Helena 1971 SO₂ nonattainment area to attainment.

(d)Maintenance plan. The EPA is approving the maintenance plan for the East Helena nonattainment area for the 1971 SO₂ NAAQS submitted by the State of Montana on October 26, 2018.

40 C.F.R. §52.1398

81 FR 28720 , May 10, 2016, as amended at 84 FR 47899 , Sept. 11, 2019

81 FR 28720 , 5/10/2016; 84 FR 47899 , 10/11/2019; 84 FR 47899 , 10/11/2019