# 35 Ill. Adm. Code 203.209: Section 203.209 Significant Emissions Determination

> Illinois · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_209

## Section

- **Citation:** 35 Ill. Adm. Code 203.209
- **Heading:** Section 203.209 Significant Emissions Determination
- **Jurisdiction:** Illinois
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Illinois Administrative Code / Title 35 ENVIRONMENTAL PROTECTION / CHAPTER I: POLLUTION CONTROL BOARD / Part 203 MAJOR STATIONARY SOURCES CONSTRUCTION AND MODIFICATION / Section 203.209 Significant Emissions Determination

## Text

Section 203
Section 203.209  Significant
Emissions Determination
a)         A net emission increase in the pollutant emitted is
significant if the rate of emission is equal to or in excess of the following:
1)         Carbon monoxide:  100 tons per year (tpy)
2)         Nitrogen oxides:  40 tpy for a nonattainment area for nitrogen
dioxide and 40 tpy for an ozone nonattainment area, except as provided in
subsection (b) of this Section
3)         Sulfur dioxide:  40 tpy
4)         Particulate matter measured as PM-10:  15 tpy
5)         Ozone:  40 tpy of volatile organic material, except as
provided in subsection (b) of this Section
6)         Lead:  0.6 tpy
b)         For areas classified as serious or severe nonattainment for
ozone, an increase in emissions of volatile organic material or nitrogen oxides
shall be considered significant if the net emissions increase of such air
pollutant from a stationary source located within such area exceeds 25 tons
when aggregated with all other net increases in emissions from the source over
any period of 5 consecutive calendar years which includes the calendar year in
which such increase occurred.  This provision shall become effective beginning
November 15, 1992, or such later date that an area is classified as a serious
or severe nonattainment area for ozone.

## Nearby sections

- [35 Ill. Adm. Code 203.201 Section 203.201  Prohibition](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_201.md)
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- [35 Ill. Adm. Code 203.203 Section 203.203  Construction Permit Requirement and Application](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_203.md)
- [35 Ill. Adm. Code 203.204 Section 203.204  Duration of Construction Permit (Repealed)](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_204.md)
- [35 Ill. Adm. Code 203.205 Section 203.205  Effect of Permits](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_205.md)
- [35 Ill. Adm. Code 203.206 Section 203.206  Major Stationary Source](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_206.md)
- [35 Ill. Adm. Code 203.207 Section 203.207  Major Modification of a Source](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_207.md)
- [35 Ill. Adm. Code 203.208 Section 203.208  Net Emission Determination](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_208.md)
- [35 Ill. Adm. Code 203.209 Section 203.209  Significant Emissions Determination](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_209.md)
- [35 Ill. Adm. Code 203.210 Section 203.210  Relaxation of a Source-Specific Limitation](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_210.md)
- [35 Ill. Adm. Code 203.211 Section 203.211  Permit Exemption Based on Fugitive Emissions](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_211.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T35_P203_S203_209. Check the current official text before relying on it. Not legal advice.