Illinois Administrative Code

Section 204.420 Good Engineering Practice a) "Good engineering practice", with respect to stack height, means the greater of: 1) 65 meters, measured from the ground-level elevation at the base of the stack; 2) The following: A) For a stack in existence on January 12, 1979, and fo…

Section 204.430 Greenhouse Gases (GHGs) "Greenhouse gases" or "GHGs" means the air pollutant defined in 40 CFR 86.1818-12(a) as the aggregate group of six greenhouse gases: CO2, nitrous oxide, methane, hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride. To represent an…

Section 204.440 High Terrain "High terrain" means any area having an elevation 900 feet or more above the base of the stack of a source.

Section 204.450 Indian Reservation "Indian reservation" means any federally recognized reservation established by treaty, agreement, executive order, or Act of Congress.

Section 204.460 Indian Governing Body "Indian Governing Body" means the governing body of any tribe, band, or group of Indians subject to the jurisdiction of the U.S. and recognized by the U.S. as possessing power of self-government.

Section 204.470 Innovative Control Technology "Innovative control technology" means any system of air pollution control that has not been adequately demonstrated in practice, but would have a substantial likelihood of achieving greater continuous emissions reduction than any cont…

Section 204.480 Low Terrain "Low terrain" means any area other than high terrain.

Section 204.490 Major Modification a) "Major modification" means any physical change in or change in the method of operation of a major stationary source that would result in: 1) A significant emissions increase (as defined in Section 204.670) of a regulated NSR pollutant (as def…

Section 204.500 Major Source Baseline Date "Major source baseline date" means: a) In the case of PM10 and SO2, January 6, 1975; b) In the case of NO2, February 8, 1988; and c) In the case of PM2.5, October 20, 2010.

Section 204.510 Major Stationary Source a) "Major stationary source" means: 1) Any of the following stationary sources of air pollutants that emits, or has the potential to emit, 100 tpy or more of any regulated NSR pollutant: A) Fossil fuel-fired steam electric plants of more th…

Section 204.520 Minor Source Baseline Date a) "Minor source baseline date" means the earliest date after the trigger date on which a major stationary source or a major modification subject to 40 CFR 52.21 or this Part submits a complete application under the relevant regulations.…

Section 204.530 Nearby "Nearby", with respect to a specific structure or terrain feature: a) For purposes of applying the formula provided in Section 204.420(a)(2), means that distance up to five times the lesser of the height or the width dimension of a structure, but not greate…

Section 204.540 Necessary Preconstruction Approvals or Permits "Necessary preconstruction approvals or permits" mean those permits or approvals required under federal air quality control laws and regulations and those air quality control laws and regulations that are part of the …

Section 204.550 Net Emissions Increase a) "Net emissions increase" means, with respect to any regulated NSR pollutant emitted by a major stationary source, the amount by which the sum of the following exceeds zero: 1) The increase in emissions from a particular physical change or…

Section 204.560 Potential to Emit "Potential to emit" means the maximum capacity of a stationary source to emit a pollutant under its physical and operational design. Any physical or operational limitation on the capacity of the source to emit a pollutant, including air pollution…

Section 204.570 Prevention of Significant Deterioration (PSD) Permit "Prevention of Significant Deterioration Permit" or "PSD Permit" means a permit or the portion of a permit for a new major source or major modification that is issued by the Agency under the construction permit …

Section 204.580 Process Unit "Process unit" means any collection of structures and/or equipment that processes, assembles, applies, blends, or otherwise uses material inputs to produce or store an intermediate or completed product. A process unit may contain more than one emissio…

Section 204.590 Project "Project" means a physical change in or change in the method of operation of an existing major stationary source.

Section 204.600 Projected Actual Emissions a) "Projected actual emissions" means the maximum annual rate, in tons per year, at which an existing emissions unit is projected to emit a regulated NSR pollutant in any one of the 5 years (12-month period) following the date the unit r…

Section 204.610 Regulated NSR Pollutant "Regulated NSR pollutant" means the following: a) Any pollutant for which a NAAQS has been promulgated. This includes, but is not limited to, the following: 1) PM2.5 emissions and PM10 emissions shall include gaseous emissions from a source…

Section 204.620 Replacement Unit "Replacement unit" means an emissions unit for which all the criteria listed in this Section are met. No creditable emission reductions shall be generated from shutting down the existing emissions unit that is replaced. a) The emissions unit is a …

Section 204.630 Repowering a) "Repowering" means replacement of an existing coal-fired boiler with one of the following clean coal technologies: atmospheric or pressurized fluidized bed combustion; integrated gasification combined cycle; magnetohydrodynamics; direct and indirect …

Section 204.640 Reviewing Authority "Reviewing authority" means the Agency or, in the case of a permit program under 40 CFR 52.21, USEPA or its delegate (the Agency).

Section 204.650 Secondary Emissions "Secondary emissions" means emissions that would occur as a result of the construction or operation of a major stationary source or major modification, but do not come from the major stationary source or major modification itself. Secondary emi…

Section 204.660 Significant a) "Significant" means, in reference to a net emissions increase or the potential of a source to emit any of the following pollutants, a rate of emissions that would equal or exceed any of the following rates: Pollutant and Emissions Rate Carbon monoxi…

Section 204.670 Significant Emissions Increase "Significant emissions increase" means, for a regulated NSR pollutant, an increase in emissions that is significant (as defined in Section 204.660) for that pollutant.

Section 204.680 Stack in Existence "Stack in existence" means that the owner or operator had begun, or caused to begin, a continuous program of physical on-site construction of the stack, or entered into binding agreements or contractual obligations that could not be cancelled or…

Section 204.690 Stationary Source "Stationary source" means any building, structure, facility, or installation that emits or may emit a regulated NSR pollutant. Emissions resulting directly from an internal combustion engine for transportation purposes or from a nonroad engine or…

Section 204.700 Subject to Regulation "Subject to regulation" means, for any air pollutant, that the pollutant is subject to either a provision in the CAA, or a nationally-applicable regulation codified by USEPA in 40 CFR 50 through 99, that requires actual control of the quantit…

Section 204.710 Temporary Clean Coal Technology Demonstration Project "Temporary clean coal technology demonstration project" means a clean coal technology demonstration project that is operated for a period of 5 years or less and that complies with Illinois' SIP and other requir…

Section 204.800 Applicability a) The requirements of this Part apply to the construction of any new major stationary source (as defined in Section 204.510) or any project at an existing major stationary source in an area designated as attainment or unclassifiable under section 10…

Section 204.810 Source Information The owner or operator of a proposed major stationary source or major modification shall submit all information necessary to perform any analysis or make any determination required under this Part. a) With respect to a source or modification to w…

Section 204.820 Source Obligation Any owner or operator who constructs or operates a source or modification not in accordance with the application submitted under this Part or with the terms of any approval to construct, or any owner or operator of a source or modification subjec…

Section 204.830 Permit Expiration Approval to construct shall become invalid if construction is not commenced within 18 months after receipt of approval, if construction is discontinued for a period of 18 months or more, or if construction is not completed within a reasonable tim…

Section 204.840 Effect of Permits Approval to construct shall not relieve any owner or operator of the responsibility to comply fully with applicable provisions of the SIP and any other requirements under local, State, or federal law.

Section 204.850 Relaxation of a Source-Specific Limitation At such time as a particular source or modification becomes a major stationary source or major modification solely by virtue of a relaxation in any enforceable limitation, established after August 7, 1980, on the capacity…

Section 204.860 Exemptions a) The requirements of Sections 204.810, 204.820, 204.830, 204.840, 204.850, 204.1100, 204.1110, 204.1120, 204.1130, 204.1140, 204.1200, and 204.1400 do not apply to a particular major stationary source or major modification, if: 1) The source or modifi…

Section 204.900 Ambient Air Increments a) In areas designated as Class I, II or III, increases in pollutant concentration over the baseline concentration shall be limited to the following: Pollutant Maximum allowable increase (micrograms per cubic meter) Class I Area PM2.5: Annua…

Section 204.910 Ambient Air Ceilings No concentration of a pollutant shall exceed: a) The concentration permitted under the national secondary ambient air quality standard; or b) The concentration permitted under the national primary ambient air quality standard, whichever concen…

Section 204.920 Restrictions on Area Classifications a) All of the following areas that were in existence on August 7, 1977 shall be Class I areas and may not be redesignated: 1) International parks; 2) National wilderness areas that exceed 5,000 acres in size; 3) National memori…

Section 204.930 Redesignation a) As of September 4, 2020, all areas of the State (except as otherwise provided by Section 204.920) are designated Class II as of December 5, 1974. Redesignation (except as otherwise precluded by Section 204.920) may be proposed by the State or Indi…

Section 205.100 Severability If any Section, subsection, sentence or clause of this Part is judged invalid, such adjudication shall not affect the validity of this Part as a whole or of any Section, subsection, sentence or clause thereof not judged invalid.

Section 205.110 Purpose The purpose of this Part is to implement the Emissions Reduction Market System (ERMS) regulatory program consistent with the assurances that are specified in Section 9.8 of the Environmental Protection Act [415 ILCS 5/9.8]. The ERMS is designed, as further…

Section 205.115 Sunset Provision This Part does not apply after April 29, 2018. Subject sources must comply with this Part before April 30, 2018. (Source: Added at 43 Ill. Reg. 441, effective December 26, 2018)

Section 205.120 Abbreviations and Acronyms Unless otherwise specified within this Part, the abbreviations used in this Part shall be the same as those found in 35 Ill. Adm. Code 211. The following abbreviations and acronyms are used in this Part: ACMA Alternative Compliance Marke…

Section 205.130 Definitions Unless otherwise specified within this Part, the definitions for the terms used in this Part shall be the same as those found in Section 39.5 of the Act [415 ILCS 5/39.5] and in 35 Ill. Adm. Code 211. "Account officer" means a natural person who has be…

Section 205.150 Emissions Management Periods a) The VOM emissions control period is the seasonal allotment period, which is from May 1 through September 30, annually. b) The reconciliation period is from October 1 to December 31, annually. During each reconciliation period, parti…