Air Permitting is a delegated program from the U.S. Environmental Protection Agency (EPA) and the State of Indiana to the City of Indianapolis. This delegation allows the City to issue air construction and operating permits to industrial sources in Marion County. The delegation includes the newly established Title V Operating Permit Program. Operating Permits are issued to approximately 300 industrial sources in Marion County. An industry's operating permit outlines the requirements under the Clean Air Act applicable to that facility and is typically valid for five years. Prior to commencing construction of new processes or equipment, that may have an impact on air emissions, companies are required to obtain approval by the Office of Environmental Services (OES) through a Construction Permit (modification or revision). The Construction Permits Program works to ensure timely permits are issued and citizen concerns are addressed.