Mississippi Administrative Code › Title 11 - Mississippi Department of Environmental Quality › Part 2 - Air Regulations › Chapter 1 - Mississippi Commission on Environmental Quality, Air Emission Regulations for the Prevention, Abatement, and Control of Air Contaminants › Rule 11-2-1.2 - Definitions

Current through June 25, 2024
The terms used in the regulations shall, unless the context
				  otherwise requires, have the following meanings:
A. "Air cleaning device." Any method, process
				or equipment which removes, reduces or renders less noxious air contaminants
				discharged into the atmosphere. This term is synonymous with air pollution
				control device.
B. "Air
				contaminant." Particulate matter, dust, fumes, gas, mist, smoke, or vapor, or
				any combination thereof produced by processes other than natural.
C. "Air contamination." The presence in the
				outdoor ambient air of one or more air contaminants which contribute to a
				condition of air pollution.
D. "Air
				contamination source." Any source at, from, or by reason of which there is
				emitted into the ambient air any air contaminant, regardless of who the person
				may be 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.
E. "Air contaminant point
				source." Any single point of emissions of any air contaminant such as from an
				individual machine or combustion device.
F. "Air pollution." The presence in the
				outdoor ambient air of one or more air contaminants in quantities, of
				characteristic, and of a duration which are materially injurious or can be
				reasonably expected to become materially injurious to human, plant, or animal
				life or to property, or which unreasonably interfere with enjoyment of life or
				use of property throughout the State or throughout such area of the State as
				shall be affected thereby.
G. "Air
				Quality Action Day." A day(s) the Executive Director determines that the air
				quality data within a specifically named area within the state may reach levels
				at or above the national ambient air quality standard for a specific
				pollutant
H. "Ambient air." The
				encompassing atmosphere existing in the matter of space and to which life of
				this earth is adapted. For the purposes of these regulations, that portion of
				the atmosphere outside of buildings, stacks, and ducts.
I. "Atmosphere." The air that envelopes or
				surrounds the earth. This term is synonymous with ambient air.
J. "Commission." The Mississippi Commission
				on Environmental Quality.
K.
				"Excess (or excessive) emission." The operation of a facility in which the
				emission of one or more pollutants exceeds the applicable limit(s).
L. "Fly ash." Particulate matter capable of
				being gasborne or airborne or carried in the gas stream and consisting
				essentially of ash, fused ash, and/or unburned material.
M. "Ground level." Unless otherwise specified
				in sampling techniques, will be considered to be in the range of one to twenty
				(20) feet of ground level. For ambient sampling, it shall also be outside the
				boundaries of the property which contains the air pollution source.
N. "Incinerator." A combustion device
				specifically designed for the destruction by high temperature burning of solid,
				semi-solid, liquid or gaseous combustible wastes and from which the solid
				residues contain little or no combustibles.
O. "Modification." Any physical change in, or
				change in the method of operation of, an affected facility which increases the
				amount of any air pollutant emitted by such facility or which results in the
				emission of any air pollutant not previously emitted, except that:
(1) Routine maintenance, repair and
				replacement shall not be considered physical changes, and
(2) An increase in the production rate or
				hours of operation shall not be considered a change in the method of operation,
				unless it is prohibited by a permit.