UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 4

The Honorable Phil Bryant Governor ofMississippi P.O. Box 139 Jackson, Mississippi 39205 Dear Governor Bryant: ATLANTA FEDERAL CENTER 61 FORSYTH STREET ATLANTA, GEORGIA 30303-8960 

# AUG 1 9 

# 2014

Thank you for the letter dated December 6, 2013, providing your recommendations ofair quality designations for the 2012 revised primary annual fine particle (PM2.s) National Ambient Air Quality Standard {NAAQS) throughout Mississippi. I appreciate the information Mississippi shared with the U.S. Environmental Protection Agency as we move forward to improve PM2
.s air quality. This letter is to notify you ofthe EPA's preliminary response to Mississippi's recommendation and to inform you of our approach for completing the initial area designations for the 2012 revised primary annual PM2
.s standard. On December 14,2012, the EPA promulgated a revised primary annual PM2
.sNAAQS (78 FR 3086, January 15, 2013). In that action, the EPA revised the primary annual PM2.s standard, strengthening it from 15.0 micrograms percubic meter (J.Lg/m3) to 12.0 J.Lg/m3 ; retained the existing 24-hour PM2
.s standard at 35 J.Lg/m3; retained the existing 24-hourPMw (coarse particle) standard at 150 J.Lg/m3; and retained the current suite ofsecondary PM standards. The EPA revised the primary annual PM2
.s standard based on an integrated assessment ofan extensive body ofnew scientific evidence, which substantially strengthens our body ofknowledge regarding PM2
.s-related health effects. The revised primary annual PM2.s standard will provide increased protection for children, older adults, persons with pre-existing heart and lung disease, and other at-risk populations against an array ofPM2
.s-related adverse health effects, including premature mortality, increased hospital admissions and emergency department visits, and development and exacerbation ofchronic respiratory disease. History shows us that better health and cleaner air go hand-in-hand with economic growth. Working closely with the states and tribes, the EPA is implementing the standards using a commonsense approach that improves air quality and minimizes the burden on state, local, and tribal governments. As part of this routine process, the EPA is working with the states and tribes to identify areas in the country that meet the standards and those that need to take steps to reduce PM2.s air pollution. Within one year of promulgating a neworrevised air quality standard, the Clean Air Act (CAA) requires the Governor of each state to submit to the EPA a list ofall areas in the state, with a designation recommendation for each area. As a first step in implementing the 2012 annual PM2.s standard, Governors were to submit their designation recommendations, including appropriate area boundaries, by December 13,2013. As required by the CAA, the EPA then promulgates designations for all areas across the country. The EPA designates an area as**~~nonattainment"** ifit is violating the 2012 annual PM2.s NAAQS or ifit is contributing to a violation ofthe NAAQS in a nearby area. Consistent with designations for previous

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### PM2
.s standards, the EP A intends to use a designation category of"unclassifiable/attainment" for areas that are monit oring attainment ordo not have monitors, but for which the EPA has reason to believe are likely attaining the NAAQS and are not contributing to nearby violations
.**Additionally ~**  

### the EPA intends to designate as "unclassifiable" those areas where the EPA cannot determine based on available information whether the area is meeting the NAAQS orwhere the EPA has not determined that the area contributes to a nearby violation
. At this time, the EPA is proceeding with intended initial area designations using quality-assured, certified air quality monitoring data for most areas from 2011 to 2013. The EPA has considered the annual PM2.5 designation recommendations submitted by Mississippi on December 6, 2013, and has reviewed the relevant technical information, including 2011-2013 air quality data. This data does not indicate any violation ofthe 2012 annual PM2.S NAAQS in Mississippi or contribution to any nearby area Accordingl y, the EPA intends to designate the entire State of Mississippi as unclassifiable/attainment. The EPA will make its preliminary designation decisions and supporting documentation available to the general public for review and comment. We will be announcing a 30-day public comment period shortly in the 

### Fed eralRegist er. After considering the additional information we receive, the EPA plans to promulgate final annual 

### PM2.s designations in December of 2014. The EPA is committed to working with the sta tes and tribes to share the responsibility ofreducing 

### PM2.s air pollution. Current and upcoming federal standards and safeguards

- including pollution reduction rules for power plants, vehicles, and fuels

- will ensure steady progress to reduce PMz
.s-forming pollution and will protect public health in communities across the country. We look forward to a continued dialogue with you and your staffas we work together to implement the 20 12 annual 

### PM2
.s standard
. Should you have any questions, please do not hesitate to contact me at (404) 562-8357, or Beverly H
. Baniste r, Director, Air Pesticides and Toxics Management Division, at (404) 562-9077, or have your staffcontact Scott Davis, Chief, Air Planning Branch, at ( 404) 562-9127. Sincerely,

# u~!F Heather McTeer

# ~ Regional Administrator

cc: Ms
. Trudy F isher, Executive Director, MDEQ Maya Rao, Chief, Air Division, MDEQ Janet G. McCabe, Acting Assistant Administrator for Air and Radiation Stephen D. Page, Director
. Office ofAir Quality Planning and Standards