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Proposed Rule 11 Sep 2025 incorporation by reference, reporting and recordkeeping requirements, environmental regulations, intergovernmental relations, environmental protection, montana, air pollution control, volatile organic compounds, air quality, ozone, nitrogen dioxide, emissions, carbon monoxide, state implementation plans, particulate matter, epa, visibility, greenhouse gases, sulfur oxides, lead

🌁Montana's Regional Haze Plan

The Environmental Protection Agency (EPA) is proposing to approve the regional haze state implementation plan (SIP) submission submitted by the State of Montana on August 10, 2022, under the Clean Air Act (CAA) and the EPA's Regional Haze Rule (RHR) for the program's second implementation period. Montana's 2022 SIP submission addresses the requirement that states revise their long-term strategies every implementation period to make reasonable progress towards the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility, including regional haze, in mandatory Class I Federal areas. Montana's 2022 SIP submission also addresses other applicable requirements for the second implementation period of the regional haze program. The EPA is also proposing to approve the prong 4 visibility portion of Montana's October 1, 2018 Infrastructure SIP submission for the 2015 ozone National Ambient Air Quality Standards (NAAQS). The EPA is taking these actions pursuant to the CAA.

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Compliance, Regulatory Requirements 17 Jan 2025 compliance, environmental regulation, environmental protection, administrative practice and procedure, reporting and recordkeeping requirements, intergovernmental relations, ozone, air pollution control, volatile organic compounds, air quality, ozone standards, nitrogen oxides, state implementation plans

🌍New SIP Deadlines and Compliance Requirements Under Ozone Regulations

The Environmental Protection Agency (EPA) is finalizing deadlines for submission of state implementation plan (SIP) revisions and implementation of the relevant control requirements that will apply for nonattainment areas reclassified as Moderate, Serious, and Severe under the current and any future ozone National Ambient Air Quality Standards (NAAQS) as a result of either failing to attain the standard by the applicable classification attainment date or the EPA granting a voluntary reclassification request. This final rule articulates the implementation requirements and timeframes that will apply for all such areas once reclassified. The EPA is also finalizing regulatory revisions to codify its existing interpretation that following reclassification, a state is no longer required to submit SIP revisions addressing certain, but not all, requirements related to the prior classification level for an ozone nonattainment area.

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