December 2015

In this issue of EM, you will find a discussion of what states and facilities can expect, and when, in complying with the 1-hr sulfur dioxide (SO2) National Ambient Air Quality Standard (NAAQS).

Inside This Month's Issue


1-Hr SO2 NAAQS: Expectations and Compliance
by Tree Raine

1-Hr SO2 NAAQS Designations and Implementation
by Scott Janoe and Zach Craft
A summary of the sequence of designation steps for four types of areas—areas containing coal-fired power plants, areas with monitoring data above the SO2 NAAQS, areas with sources emitting more than 2,000 tons per year, and areas with clusters of smaller SO2 sources—in the wake of the SO2 NAAQS consent decree and final Data Requirements Rule.

Attainment Designations and the SO2 Data Requirements Rule: Progress So Far, But What Happens Next?
Richard Hamel
A look at the complex, deadline-shifting designation process for the 1-hr SO2 NAAQS from a modeler’s perspective.

Also In This Issue

Industry Spotlight: Airport Carbon Accreditation
A Unique Industry-Driven Sustainability Program

by Juan A. Maldonado
The Airport Carbon Accreditation (ACA) Program embodies key features that make it a compelling sustainability initiative. It balances having a rigorous common framework for climate action while maintaining enough flexibility to accommodate a broad range of competencies and resources held by airports.

Conference Highlights: Dispatch from the 11th
Conference on Air Quality Modeling

Anthony J. Sadar
A synopsis of the U.S. Environmental Protection Agency’s (EPA) 11th Conference on Air Quality Modeling, held at EPA’s Research Triangle Park, NC, campus on August 12 and 13, 2015, and the public hearing on proposed revisions to 40 CFR Part 51, Appendix W, Guideline on Air Quality Models.

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