Approval and Promulgation of Air Quality Implementation Plans; Maryland; Redesignation Request and Associated Maintenance Plan for the Baltimore, Maryland Nonattainment Area for the 1997 Annual Fine Particulate Matter Standard
The Environmental Protection Agency (EPA) is proposing to approve the State of Maryland's request to redesignate to attainment the Baltimore, Maryland Nonattainment Area (Baltimore Area or Area) for the 1997 annual fine particulate matter (PM2.5) national ambient air quality standard (NAAQS). The EPA has determined that the Baltimore Area attained the standard and is proposing to determine that it continues to attain the standard. In addition, EPA is proposing to approve, as a revision to the Maryland State Implementation Plan (SIP), the Baltimore Area maintenance plan to show maintenance of the 1997 annual PM2.5 NAAQS through 2025 for the Area. The maintenance plan includes the 2017 and 2025 PM2.5 and nitrogen oxides (NOX) mobile vehicle emissions budgets (MVEBs) for the Baltimore Area for the 1997 annual PM2.5 NAAQS, which EPA is proposing to approve for transportation conformity purposes. These actions are being taken under the Clean Air Act (CAA).
Notice of Availability of Guidance for Applying Quantitative Data To Develop Data-Derived Extrapolation Factors for Interspecies and Intraspecies Extrapolation
This notice announces the availability of Guidance for Applying Quantitative Data to Develop Data-Derived Extrapolation Factors for Interspecies and Intraspecies Extrapolation (DDEF Guidance). This document lays out methods for calculation of factors compensating for the application of animal toxicity data to humans (interspecies) and for compensating for sensitive populations (intraspecies). The use of data to conduct these extrapolations rather than rely on default values advances EPA's policy of considering relevant data first when conducting its chemical assessments.
Adequacy Determination for Lamar and Steamboat Springs PM10
In this notice, the Environmental Protection Agency (EPA) is notifying the public that the Agency has found the following adequate for transportation conformity purposes: The ``Revised PM10 Maintenance Plan for the Lamar Attainment/Maintenance Area'' and its motor vehicle emissions budget, and the ``Revised PM10 Maintenance Plan for the Steamboat Springs Attainment/Maintenance Area'' and its motor vehicle emissions budget. As more fully explained in the Supplementary Information section of this notice, this finding will affect future transportation conformity determinations.
Identification of Nonattainment Classification and Deadlines for Submission of State Implementation Plan (SIP) Provisions for the 1997 Fine Particle (PM2.5
The Environmental Protection Agency (EPA) published a final rule in the Federal Register on June 2, 2014, updating 40 CFR part 81, ``Designation of Areas for Air Quality Planning Purposes'' for the 1997 and 2006 PM2.5 NAAQS nonattainment areas. An error in the table for the Wisconsin 2006 24-hour PM2.5 NAAQS in 40 CFR 81.350 is identified and corrected in this action.
Approval and Promulgation of Implementation Plans; Washington: General Regulations for Air Pollution Sources
The Environmental Protection Agency (EPA) is approving revisions to the Washington State Implementation Plan (SIP) submitted by the Department of Ecology (Ecology) on January 27, 2014. These revisions were submitted in accordance with the requirements of section 110 of the Clean Air Act, which requires states to develop a plan for the implementation, maintenance, and enforcement of the National Ambient Air Quality Standards (NAAQS). The revisions update the general air quality regulations that apply to sources within Ecology's jurisdiction, except for major source specific provisions which the EPA is addressing separately.