The Honorable Jolm Kasich 

Governor of Ohio 

Riffe Center, 30111 Floor 

77 South High Street 

Columbus, Ohio 43215 

Dear Governor Kasich: 

Thank you for your recommendations dated September 16, 2015 on air quality designations for the State 

of Ohio for the 2010 revision to the primary National Ambient Air Quality Standard (N AAQS) for 

sulfur dioxide (S02). Reducing levels ofS02 pollution is an important part of the U.S. Environmental 

Protection Agency's conm1itment to a clean, healthy environment. Exposure to S02 can cause a range 

of adverse health effects, including narrowing of the airways which can cause difficulty breathing and 

increased asthma symptoms. This letter is to notify you of EPA's preliminary intentions regarding your 

recommended designations. 

On June 3, 2010, EPA strengthened the health-based or "primary" standard for S02 by establishing a 

standard for 1-hour average S02 concentrations at a level of 75 parts per billion. Within one year after a 

new or revised standard is established, the Clean Air Act requires the Governor of each state to submit 

to EPA a list of all areas in the state, with recommendations for whether each area meets the standard. 

Through an interactive process, EPA considers the recommendations and then promulgates designations 

for all areas across the country. On July 25, 2013, EPA designated 29 areas in 16 states as 

nonattairunent based on monitored violations, but did not at that time designate other areas. Pursuant to 

a March 2, 2015, court-ordered schedule, 1 EPA must complete the remaining S02 designations by three 

specific deadlines: July 2, 2016, December 31,2017, and December 31,2020. 

This current round of designations, to be completed by July 2, 2016, addresses two groups of areas: (1) 

areas that have newly monitored violations of the 2010 S02 NAAQS based on the most recent three 

calendar years of cettified monitored ambient air quality data, and (2) areas that contain any stationary 

source that had not been announced as of March 2, 2015, for retirement and that according to EPA's Air 

Markets Database emitted in 2012 either (i) more than 16,000 tons of S02 or (ii) more than 2,600 tons of 

S02 with an annual average emission rate of at least 0.45 pounds of SO:VMMBTU. 

1 Sierra Club v. McCarthy, No. 3-1 3-cv-3953 (SI) (N.D. Cal. Mar. 2, 2015). 

Recycled/Recyclable • Printed w ith Vegetable Oil Based Inks on 100% Recycled Paper (100% Post-Consumer) 
Because EPA has insufficient information to determine whether the following area is meeting or not 

meeting the S02 NAAQS, EPA intends to designate this area as unclassifiable: 

Intended Unclassifiable Area 

Gallia County * 

Intended Unclassifiable Counties 

Gallia County 

Meigs County (p) 

The asterisk(*) indicates a modification to the designation that your staff recommended. The (p) 

indicates only a portion of the county will be designated. 

The enclosed Technical Support Document provides a detailed analysis that supports our intended 

designation decisions. If your state has additional information that EPA should consider prior to 

finalizing these designations, please submit it to us by April 19, 2016. We also will be publishing a 

notice in the Federal Register announcing a 30-day period for the public to provide input on EPA's 

intended designation decisions. We will promulgate the designations for these areas by July 2, 2016. 

We will designate all other previously undesignated areas in the state on a schedule consistent with the 

prescribed timing ofthe court order, i.e., by December 31,2017, or December 31,2020. 

We look forward to a continued dialogue with you and your staff as we work together to complete the 

area designations and implement the 2010 primary S02 standard. For additional information regarding 

designations under the S02 standard, please visit our website at www.epa.gov/so2designations. Should 

you have any questions, please do not hesitate to call me, or have your staff contact me at 312-886-3000, 

or George Czerniak, Director, Air and Radiation Division, at 312-353-2212 or czemiak.george@epa.gov. 

Sincerely, 

!pUll { 

Robert A. Kaplan 

Acting Regional Administrator 

Enclosure 

cc: Craig Butler, Director 

Ohio Environmental Protection Agency 

Robert Hodanbosi, Chief 

Division of Air Pollution Control 

Ohio Environmental Protection Agency