UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

WASHINGTON, D.C. 20460 

The Honorable Nikki R. Haley 

Governor of South Carolina 

1205 Pendleton Street 

Columbia, South Carolina 2921 1 

Dear Governor Haley: 

Die J a 2014 

THE ADMINISTRATOR 

I am writing to summarize the U.S. Environmental Protection Agency's recent action to address fine 

particle pollution in your state. As required by the Clean Air Act, the EPA has determined which areas 

are meeting the national ambient air quality standards for fine particle pollution and which areas must 

take steps to reduce emissions that contribute to violations ofthe standard. 

On December 14, 2012, the EPA strengthened the annual, health-based fine particle standard from 15.0 

micrograms per cubic meter ()lg/m3

) to 12.0 11glm3. Thousands of scientific studies have linked exposure 

to these tiny particles- approximately 1 /30th the size of a human hair- with serious human health 

problems including premature death in people with heart and lung disease, nonfatal heari attacks, and 

increased hospital admissions and doctor and emergency room visits for respiratory and cardiovascular 

disease. 

I appreciate the information you and your staff have shared with the EPA throughout this process to 

assess fine particle pollution levels in communities across your state and the impact of emission sources 

that could be contributing to unhealthy air. After considering your recommendations, reviewing the most 

recent certified fine particle air quality data for your state and evaluating factors to assess contribution to 

nearby levels of fine particle pollution, I am pleased to inform you that at this time, no area within South 

Carolina violates the 2012 standard or contributes to a nearby violation ofthe standard. As a result, 

consistent with your area recommendations and with your comments provided during the 120-day 

process, the EPA is designating most of your state "unclassifiable/attainment." 

As we have been discussing with your staff, the EPA identified data quality issues earlier this year that 

invalidated fine particle pollution monitoring data for parts of Georgia. As a result, EPA does not have 

sufficient air quality monitoring data for 2011-2013 to determine whether Aiken County, South Carolina 

associated with the Augusta, Georgia area contributes to a nearby violation at the Georgia monitoring 

sites if a violation at those sites were to be identified. The EPA expects that for this multi-state area, 

additional monitoring data collected after 2013 will provide the requisite amount of valid data for 

designations and the EPA is deferring final designations for the area. Accordingly, the EPA is deferring 

its final decision for Aiken County, South Carolina. 

Internet Address (URL) • http://www.epa.gov 

Recycled/Recyclable • Prinled with Vegetable Oil Based Inks on 100% Poslconsumer, Process Chlorine Free Recycled Paper 
Because air quality monitoring for 2014 is nearly complete, if a state or tribe requests it, the EPA will 

evaluate the status of an area based on its annual tine particle monitoring data for 2012-2014. If you 

would like the EPA to ·re-evaluate any areas within your state, please submit to the EPA, complete, 

quality-assured and certified air quality data for 2014 by February 27,2015. 

The EPA shares responsibility with the states and tribes for managing particle poUution levels. Efforts 

by states and tribes to attain the 1997 and 2006 fine particle pollution standards are already working to 

reduce unhealthy levels of fine particle pollution. In addition, current and upcoming federal standards 

and safeguards, including pollution reduction rules for power plants, vehicles and fuels will assure 

steady reductions of fine particle pollution and will protect public health in communities across the 

country. 

Together, we have made considerable progress to reduce fine particle pollution. Nationwide, monitored 

levels of fine particle pollution have fallen 34 percent since 2000 when we first began nationwide 

monitoring for particles of this size. I am confident this progress will continue as we work together 

towards our shared goal of clean air. For additional information about these designations, please visit 

our website at: www.epa.uov/pmdesignations. 

If you have questions or concerns, please contact me or your staff may contact Mark Rupp, Deputy 

Associate Administrator for Intergovernmental Relations, at rupp.markrt.ikpa.gov or at (202) 564-7178. 

Sincerely,