Nitrogen dioxide

Reconsideration of the National Ambient Air Quality Standards for Particulate Matter

Based on the Environmental Protection Agency's (EPA's) reconsideration of the air quality criteria and the national ambient air quality standards (NAAQS) for particulate matter (PM), the EPA is revising the primary annual PM<INF>2.5</INF> standard by lowering the level from 12.0 [micro]g/m\3\ to 9.0 [micro]g/m\3\. The Agency is retaining the current primary 24-hour PM<INF>2.5</INF> standard and the primary 24-hour PM<INF>10</INF> standard.

Publication Date: 
Wednesday, March 6, 2024 - 4:00am

Air Plan Approval and Operating Permit Program Approval; Connecticut; Revision to Definitions

The Environmental Protection Agency (EPA) is taking final action to approve, through parallel processing, a revised definition in the State Implementation Plan (SIP) and the Title V Operating Permit Program for the State of Connecticut. On November 30, 2023, the Connecticut Department of Energy and Environmental Protection (CT DEEP) submitted to EPA the State's adopted regulatory amendments to the definition of ``severe non-attainment area for ozone'' for inclusion in the EPA-approved SIP and Title V Operating Permit Program.

Publication Date: 
Monday, February 12, 2024 - 4:00am

Air Plan Approval; Georgia; Vehicle Inspection and Maintenance Program

The Environmental Protection Agency (EPA) is approving changes to Georgia's State Implementation Plan (SIP) submitted by the State of Georgia through the Georgia Department of Natural Resources (GA DNR), Environmental Protection Division (EPD), on June 8, 2022, and on June 6, 2023.

Publication Date: 
Friday, February 9, 2024 - 4:00am

Air Plan Approval; WA; Excess Emissions, Startup, Shutdown, and Malfunction Revisions

The Environmental Protection Agency (EPA) is approving State Implementation Plan (SIP) revisions submitted by the State of Washington, through the Department of Ecology on November 12, 2019. The revisions were submitted by Washington in response to EPA's June 12, 2015 ``SIP call'' in which EPA found a substantially inadequate Washington SIP provision providing affirmative defenses that operate to limit the jurisdiction of the Federal court in an enforcement action related to excess emissions during startup, shutdown, and malfunction (SSM) events.

Publication Date: 
Thursday, December 28, 2023 - 4:00am

Air Plan Approval; Arizona; Maricopa County Air Quality Department

The Environmental Protection Agency (EPA) is proposing to approve revisions to the Maricopa County Air Quality Department (MCAQD) portion of the Arizona State Implementation Plan (SIP). These revisions concern a rule that includes definitions for certain terms that are necessary for the implementation of local rules that regulate sources of air pollution. We are proposing to approve the rule under the Clean Air Act (CAA or the Act). We are taking comments on this proposal and plan to follow with a final action.

Publication Date: 
Wednesday, December 27, 2023 - 4:00am

Air Plan Disapproval; Louisiana; Excess Emissions

Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is disapproving a State Implementation Plan (SIP) revision submitted by the State of Louisiana, through the Louisiana Department of Environmental Quality (LDEQ), on November 20, 2016, and supplemented on June 9, 2017. The submittals were in response to the EPA's national SIP call on June 12, 2015, concerning excess emissions during periods of Startup, Shutdown, and Malfunction (SSM).

Publication Date: 
Thursday, December 7, 2023 - 4:00am

Approval and Promulgation of Implementation Plans; New York; Elements of the 2008 and 2015 Ozone National Air Quality Standards

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of New York for purposes of certifying and meeting the requirements for Reasonably Available Control Technology (RACT) for the Serious classification of the 2008 and Moderate classification of the 2015 8-hour Ozone National Ambient Air Quality Standards (NAAQS). The EPA is also approving that this SIP revision fulfills SIP requirements pertaining to the Ozone Transport Region (OTR) for the 2015 Ozone NAAQS.

Publication Date: 
Thursday, November 9, 2023 - 4:00am

Air Plan Approval and Disapproval; Colorado; Serious Attainment Plan Elements and Related Revisions for the 2008 8-Hour Ozone Standard for the Denver Metro/North Front Range Nonattainment Area

The Environmental Protection Agency (EPA) is approving portions and disapproving portions of a state implementation plan (SIP) revision submitted by the State of Colorado to meet Clean Air Act (CAA) requirements for the 2008 8-hour ozone national ambient air quality standards (NAAQS) in the Denver Metro/North Front Range nonattainment area (DMNFR Area). Specifically, the EPA is approving the submitted enhanced monitoring SIP element as meeting applicable Serious area requirements for the 2008 8-hour ozone NAAQS, and is disapproving the contingency measure element of the SIP submittal.

Publication Date: 
Tuesday, November 7, 2023 - 4:00am

Air Plan Approval; FL; Miscellaneous SIP Revision

The Environmental Protection Agency (EPA) is approving a Florida State Implementation Plan (SIP) revision, submitted by the State of Florida through the Florida Department of Environmental Protection (FDEP) on April 1, 2022. The SIP revision revises multiple stationary source rules in Florida's SIP with substantive and minor changes throughout. EPA is approving these changes pursuant to the Clean Air Act (CAA or Act).

Publication Date: 
Monday, November 6, 2023 - 4:00am

Air Plan Approval; Virginia; 1997 8-Hour Ozone National Ambient Air Quality Standard Second Maintenance Plan for the Hampton Roads Area

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the Commonwealth of Virginia (Commonwealth or Virginia). This revision pertains to the Commonwealth's plan, submitted by the Virginia Department of Environmental Quality (VADEQ), for maintaining the 1997 8-hour ozone national ambient air quality standards (NAAQS) (referred to as the ``1997 ozone NAAQS'') in the Norfolk-Virginia Beach-Newport News (Hampton Roads), VA Area (Hampton Roads Area).

Publication Date: 
Tuesday, October 17, 2023 - 4:00am

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