Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 243 - AIR QUALITY STANDARDS › Subpart A - GENERAL PROVISIONS › Section 243.101 - Definitions

Current through Register Vol. 48, No. 28, July 12, 2024
For the purposes of this Part, terms listed below will have
				  the meanings attributed to them in this Section. As used in this Part, all
				  terms not defined in this Section will have the meaning given them by the Act;
				  the CAA, incorporated by reference in Section
				  243.108;
				  or 35 Ill. Adm. Code
				  201.102.
"Act" means the Environmental Protection Act [415 ILCS
				  5].
"Agency" means the Illinois Environmental Protection
				  Agency.
"Ambient air" means that portion of the atmosphere, external
				  to buildings, to which the general public has access.
"Clean Air Act" or "CAA" means the federal Clean Air Act
				  (42 USC
				  7401 et seq., as amended), incorporated by
				  reference in Section 243.108.
"Exceedance of a NAAQS" means one occurrence of a measured or
				  modeled concentration that exceeds the specified concentration level of that
				  NAAQS for the averaging period specified by the standard.
"Exceptional event" means an event and its resulting
				  emissions that fulfills all of the following criteria:
The event affects air quality in such a way that there exists
				  a clear causal relationship between the specific event and the monitored
				  exceedance or violation;
The event is not reasonably controllable or
				  preventable;
The event is caused by human activity that is unlikely to
				  recur at a particular location or a natural event; and
The event is determined by USEPA in accordance with
				  40
				  CFR 50.14 to be an exceptional event.
An "exceptional event" does not include any of the
				  following:
Air pollution relating to source noncompliance;
Stagnation of air masses and meteorological
				  inversions;
A meteorological event involving high temperatures or lack of
				  precipitation (i.e., severe, extreme or exceptional drought).
BOARD NOTE: Stagnation of air masses, meteorological
				  inversions, and meteorological events involving high temperatures or lack of
				  precipitation do not directly cause pollutant emissions and are not exceptional
				  events. However, conditions involving high temperatures or lack of
				  precipitation may promote occurrences of particular types of exceptional
				  events, such as wildfires or high wind events, that do directly cause
				  emissions.
"Federal equivalent method" or "FEM" means a method for
				  measuring the concentration of an air pollutant in the ambient air that USEPA
				  has designated as an equivalent method pursuant to 40 CFR 53 and that is
				  included in the List of Designated Methods, including later updates, as
				  incorporated by reference in Section 243.108; the term "federal equivalent
				  method" does not include a method for which USEPA has cancelled or superseded
				  an equivalent method designation in accordance with
				  40 CFR
				  53.11 or
				  53.16,
				  as reflected in the incorporation by reference in Section 243.108.
BOARD NOTE: Derived from
				  40
				  CFR 50.1(f) (definition of
				  "equivalent method"), 50.11(d)(2) (parenthetical definition of "FEM"), and 53.1
				  (definition of "federal equivalent method"). The clause "including later
				  updates" in this definition is intended to exclude methods canceled by USEPA
				  pursuant to
				  40 CFR
				  53.11 or
				  53.16
				  for which the cancellation is included in the updates to List of Designated
				  Methods incorporated by reference in Section 243.108. A federal designation of
				  an FEM becomes effective upon publication of a notice in the Federal Register.
				  A federal cancellation of an FEM becomes effective upon deletion from the
				  listing of FEMs.
"Federal land manager" means the Secretary of the department
				  with authority over the federal Class I area (or the Secretary's
				  designee).
BOARD NOTE: See
				  40
				  CFR 50.1(r) and
				  51.301 (definitions
				  of "federal land manager"). There are no federal Class I areas in or
				  immediately abutting Illinois. See subpart D of 40 CFR 81.
"Federal reference method" or "FRM" means a method of
				  sampling and analyzing the ambient air for an air pollutant that USEPA has
				  specified as a reference method in an appendix to 40 CFR 50, incorporated by
				  reference in Section 243.108, or a method that USEPA has designated as a
				  reference method pursuant to 40 CFR 53 and that is included in List of
				  Designated Methods, including later updates, incorporated by reference in
				  Section 243.108; the term "federal reference method" does not include a method
				  for which USEPA has cancelled or superseded a reference method designation in
				  accordance with
				  40 CFR
				  53.11 or
				  53.16,
				  as reflected in the incorporation by reference in Section 243.108.
BOARD NOTE: Derived from
				  40
				  CFR 50.1(f) (definition of
				  "reference method") and 53.1 (definition of "federal reference method"). The
				  clause "including later updates" in this definition is intended to include
				  methods canceled by USEPA pursuant to
				  40 CFR
				  53.11 or
				  53.16
				  for which the cancellation is included in the updates to List of Designated
				  Methods incorporated by reference in Section 243.108. A federal designation of
				  an FRM becomes effective upon publication of a notice in the Federal Register.
				  A federal cancellation of an FRM becomes effective upon deletion from the
				  listing of FRMs or from an appendix to 40 CFR 50.
"High wind dust event" is an event that includes the
				  high-speed wind and the dust that the wind entrains and transports to a
				  monitoring site.
"High wind threshold" is the minimum wind speed capable of
				  causing particulate matter emissions from natural undisturbed lands in the area
				  affected by a high wind dust event.
"Micrograms per cubic meter" or
				  "µg/m3" means one millionth
				  (10-6) of a gram of a contaminant per cubic meter of
				  ambient air, as measured and determined by the methods prescribed for that
				  contaminant.
BOARD NOTE: The Board added this definition and that for
				  "milligrams per liter".
"Milligrams per cubic meter" or
				  "mg/m3" means one thousandth
				  (10-3) of a gram of a contaminant per cubic meter of
				  ambient air, as measured and determined by the methods prescribed for that
				  contaminant.
"National Ambient Air Quality Standard" or "NAAQS" means a
				  standard established by USEPA that applies for outdoor air throughout the
				  United States.
BOARD NOTE: The Board added this definition, derived from the
				  definition in "Terms of Environment: Glossary, Abbreviations, and Acronyms"
				  (December 1997), EPA 175-B-97-001, at p. 30. USEPA has codified the NAAQS at 40
				  CFR 50.
BOARD NOTE: The Board added this definition based on the
				  definition in "Terms of Environment: Glossary, Abbreviations, and Acronyms"
				  (December 1997), document number EPA 175-B-97-001, USEPA, Office of
				  Communications, Education, and Public Affairs, at p. 30.
"Natural event" means an event and its resulting emissions,
				  which may recur at the same location, in which human activity plays little or
				  no direct causal role. For purposes of this definition, anthropogenic sources
				  that are reasonably controlled are not human activity that plays a direct
				  causal role in causing emissions.
"Parts per billion" or "ppb" means the ratio of the parts of
				  a specified contaminant to a billion parts of air by weight
				  (1:10-9), as measured and determined by the methods
				  prescribed for that contaminant.
BOARD NOTE: The Board added this definition and that for
				  "parts per million", derived from the parentheticals in
				  40
				  CFR 50.4(a) and (b) and
				  50.17(a)
				  and the definition of "parts per billion (ppb)/parts per million (ppm)" in
				  "Terms of Environment: Glossary, Abbreviations, and Acronyms" (December 1997),
				  EPA 175-B-97-001, at p. 34.
"Parts per million" or "ppm" means the ratio of the parts of
				  a specified contaminant to a million parts of air by weight
				  (1:10-6), as measured and determined by the methods
				  prescribed for that contaminant.
BOARD NOTE: The Board added this definition, derived from the
				  parentheticals in
				  40
				  CFR 50.4(a) and (b) and
				  50.17(a)
				  and the definition of "parts per billion (ppb)/parts per million (ppm)" in
				  "Terms of Environment: Glossary, Abbreviations, and Acronyms" (December 1997),
				  EPA 175-B-97-001, at p. 34.
"PM10" means particulate matter that
				  has an aerodynamic diameter less than or equal to a nominal 10 micrometers
				  (µm).
BOARD NOTE: The Board added this definition, derived from the
				  parenthetical definition in
				  40
				  CFR 50.6(c).
"PM2.5" means particulate matter that
				  has an aerodynamic diameter less than or equal to a nominal 2.5 micrometers
				  (µm).
BOARD NOTE: The Board added this definition, derived from the
				  parenthetical definition in
				  40
				  CFR 50.7(a).
"Prescribed fire" is any fire intentionally ignited by
				  management actions in accordance with applicable laws, policies, and
				  regulations to meet specific land or resource management objectives.
"Traceable" means that a local standard has been compared and
				  certified either directly or via not more than one intermediate standard, to a
				  primary standard, such as a National Bureau of Standards Standard Reference
				  Material (NBS SRM), or a USEPA/NBS-approved Certified Reference Material
				  (CRM).
"USEPA" means the United States Environmental Protection
				  Agency.
BOARD NOTE: Derived from
				  40
				  CFR 50.1(c). The Board has
				  used "USEPA" in text where USEPA has used "Administrator", if action by USEPA
				  is clearly contemplated. Otherwise, the Board has retained the term "Agency" as
				  defined in this Section.
"Wildfire" is any fire started by an unplanned ignition
				  caused by lightning; volcanoes; other acts of nature; unauthorized activity; or
				  accidental, human-caused actions, or a prescribed fire that has developed into
				  a wildfire. A wildfire that predominantly occurs on wildland is a natural
				  event.
"Wildland" means an area in which human activity and
				  development are essentially non-existent, except for roads, railroads, power
				  lines, and similar transportation facilities. Structures, if any, are widely
				  scattered.
BOARD NOTE: Derived from
					 40
					 CFR 50.1 (2016), except as otherwise more
					 specifically indicated.