(1) "Air-cleaning device" means any method, process, or equipment which removes, reduces, or renders less noxious air contaminants discharged into the atmosphere;

(2) "Air contaminant" means any solid, liquid, gas, or vapor or any combination thereof;

(3) "Air contamination" means the presence in the outdoor atmosphere of one (1) or more air contaminants that contribute to a condition of air pollution;

(4) "Air contamination source" means any source at, from, or by reason of which there is emitted into the atmosphere any air contaminant, regardless of who owns or operates the building, premises, or other property in, at, or on which such source is located or the facility, equipment, or other property by which the emission is caused or from which the emission comes;

(5) "Air pollution" means the presence in the outdoor atmosphere of one (1) or more air contaminants in quantities, of characteristics, and of a duration that are materially injurious or can be reasonably expected to become materially injurious to human, plant, or animal life or to property, or that unreasonably interfere with enjoyment of life or use of property throughout the state or throughout the area of the state as shall be affected thereby;

(6) "Area of the state" means any city or county, or portion thereof, or other substantial geographical area of the state as may be designated by the Arkansas Pollution Control and Ecology Commission;

(7) "Commission" means the Arkansas Pollution Control and Ecology Commission;

(8) "Department" means the Arkansas Department of Environmental Quality or its successor;

(9) "Director" means the Director of the Arkansas Department of Environmental Quality or its successor;

(10) "Major source construction" means the construction of a new major stationary source or a major modification of an existing major stationary source as the terms "major stationary source" and "major modification" are defined in 40 C.F.R. Part 51.165, if applicable, or 40 C.F.R. Part 51.166, as they existed on July 1, 2012;

(11) "NAAQS state implementation plan" means a state implementation plan that specifies measures to be used in the implementation of the state's duties under 42 U.S.C. § 7410, for the attainment and maintenance of a specified National Ambient Air Quality Standard;

(12) "National Ambient Air Quality Standard" or "NAAQS" means a national primary or secondary ambient air quality standard established under Title I of the Clean Air Act, 42 U.S.C. § 7401 et seq., and 40 C.F.R. Part 50;

(13) "Person" means any individual, partnership, firm, company, public or private corporation, association, joint-stock company, trust, estate, political subdivision, or any agency, board, department, or bureau of the state, or any other legal entity whatever that is recognized by law as the subject of rights and duties; and

(14) "State implementation plan" means a plan that specifies measures to be used in the implementation of the state's duties under the Clean Air Act, 42 U.S.C. § 7401 et seq., and that is developed by the department and submitted to the United States Environmental Protection Agency for review and approval.