ST.

PRO

E. SCOTT PRUITT ADMINISTRATOR

The Honorable John Kasich Governor of Ohio 77 South High Street Columbus, Ohio 43215

Dear Governor Kasich:

I am writing to inform you that the U.S. Environmental Protection Agency has completed additional area designations for the health-based National Ambient Air Quality Standard for sulfur dioxide (SO2) established in 2010. The enclosed table summarizes the portions of Ohio the agency is designating at this time. These designations are explained more fully in the accompanying technical support document available at https://www. epa.go v/sulfur-dioxide-design ations/final- technical-support-documents-area-designations-round-3. This action completes area designations for Ohio.

Improving air quality to protect public health is a shared goal. Through local, state, tribal, and national programs, we have made considerable progress to reduce SO 2 levels throughout the country. Nationwide, monitored levels of sulfur dioxide have dropped 85 percent since 1990. I appreciate the work you have done and the partnership we have developed to achieve this impressive reduction.

If you have questions or concerns, please contact me or your staff may contact Troy Lyons, Associate Administrator for the Office of Congressional and Intergovernmental Relations, at lyons.troyepa.gov or at (202) 564-5200.

1200 PENNSYLVANIA AVE. NW • MAIL CODE 1 101A . WASHINGTON, DC 20460 • (202) 564-4700 • FAX: (202) 501-1450

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..:Ohk--2OlOSuIfürDioxide,NAAQS(Primary) .. : ______Designation Designated area Date2 ... Hamilton County ______Attainment! Unclassifiable Hancock County ______Attainment! Unclassifiable Hardin County ______Attainment! Unclassifiable Harrison County ______Attainment! Unclassifiable Henry County ______Attainment! Unclassifiable Highland County ______Attainment! Unclassifiable Hocking County ______Attainment! Unclassifiable Holmes County ______Attainment! Unclassifiable Huron County ______Attainment! Unclassifiable Jackson County ______Attainment! Unclassifiable Jefferson County (part) (remainder) ______Attainment! Unclassifiable Knox County ______Attainment! Unclassifiable Lawrence County ______Attainment! Unclassifiable Licking County ______Attainment! Unclassifiable Logan County ______Attainment! Unclassifiable Lorain County ______Attainment! Unclassifiable Lucas County ______Attainment! Unclassifiable Madison County ______Attainment! Unclassifiable Mahoning County ______Attainment! Unclassifiable Marion County ______Attainment! Unclassifiable Medina County ______Attainment! Unclassifiable Meigs County (part) (remainder) ______Attainment! Unclassifiable Mercer County ______Attainment! Unclassifiable Miami County ______Attainment! Unclassifiable Monroe County ______Attainment! Unclassifiable Montgomery County ______Attainment! Unclassifiable Morgan County (part) (remainder) ______Attainment! Unclassifiable Morrow County ______Attainment! Unclassifiable Muskingum County ______Attainment! Unclassifiable Noble County. ______Attainment! Unclassifiable Ottawa County ______Attainment! Unclassifiable Paulding County ______Attainment! Unclassifiable Perry County ______Attainment! Unclassifiable Pickaway County ______Attainment! Unclassifiable Pike County ______Attainment! Unclassifiable Portage County ______Attainment! Unclassifiable Preble County ______Attainment! Unclassifiable Putnam County ______Attainment! Unclassifiable Richland County ______Attainment! Unclassifiable Ross County ______Attainment! Unclassifiable Sandusky County ______Attainment! Unclassifiable Scioto County ______Attainment! Unclassifiable V V

V Ohio--2010 Sulfur Dioxide NAAQS (Primary) V

V ______Designation

V V

V Designated area' ••• V Date2 Type

Seneca County ______Attainment! Unclassifiable Attainment! Unclassifiable Shelby County V ______Stark County ______Attainment! Unclassifiable

Summit County ______Attainment! Unclassifiable Trumbull County V Attainment! Unclassifiable Tuscarawas County ______Attainment! Unclassifiable Union County ______Attainment! Unclassifiable Van Wert County - Attainment! Unclassifiable Vinton County ______Attainment! Unclassifiable Warren County ______Attainment! Unclassifiable Washington County (part) (remainder) ______Attainment! Unclassifiable Wayne County ______Attainment! Unclassifiable Williams County ______Attainment! Unclassifiable Wood County ______Attainment! Unclassifiable Wyandot County ______Attainment! Unclassifiable

'Includes any Indian country in each county or area, unless otherwise specified. The EPA is not detennining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country. V V

2 This date is 90 days after publication in the Federal Register, unless otherwise noted.