Section 203.1230  Major Stationary Source

a)         The following constitute a major stationary source:

1)         For an area designated as nonattainment for ozone, a major stationary source for ozone is a stationary source which emits or has the potential to emit VOM in an amount equal to or greater than the following:

A)        100 tpy in an area classified as marginal or moderate nonattainment for ozone;

B)        50 tpy in an area classified as serious nonattainment for ozone;

C)        25 tpy in an area classified as severe nonattainment for ozone; and

D)        10 tpy in an area classified as extreme nonattainment for ozone.

2)         For an area designated as nonattainment for ozone, a major stationary source for ozone is a stationary source which emits or has the potential to emit NO_X in an amount equal to or greater than the following, unless the USEPA has made a finding under sections 110 and 182(f) of the CAA (42 U.S.C. 7410, 7511a(f)) that controlling of emissions of NO_X from such source shall not be required:

A)        100 tpy in an area classified as marginal or moderate nonattainment for ozone;

B)        50 tpy in an area classified as serious nonattainment for ozone;

C)        25 tpy in an area classified as severe nonattainment for ozone; and

D)        10 tpy in an area classified as extreme nonattainment for ozone.

3)         For an area designated nonattainment for PM₁₀, a major stationary source is a stationary source which emits or has the potential to emit:

A)        100 tpy or more of PM₁₀ in an area classified as moderate nonattainment for PM₁₀; and

B)        70 tpy or more of PM₁₀ in an area classified as serious nonattainment for PM₁₀.

4)         For an area designated nonattainment for PM_2.5, a major stationary source is a stationary source which emits or has the potential to emit:

A)        100 tpy or more of direct PM_2.5 emissions in an area classified as moderate nonattainment for PM_2.5;

B)        100 tpy or more of any individual precursor for PM_2.5 (as required in Section 203.1340) in an area classified as moderate nonattainment for PM_2.5;

C)        70 tpy or more of direct PM_2.5 emissions in an area classified as serious nonattainment for PM_2.5; and

D)        70 tpy or more of any individual precursor for PM_2.5 (as required in Section 203.1340), in an area classified as serious nonattainment for PM_2.5.

5)         For an area designated nonattainment for CO, a major stationary source is a stationary source which emits or has the potential to emit:

A)        100 tpy or more in an area classified as moderate nonattainment for CO, except as provided in subsection (a)(5)(B);

B)        50 tpy or more in an area classified as serious nonattainment for CO where stationary sources significantly contribute to ambient CO levels, as determined under rules issued by the USEPA, under the CAA.

6)         For an area designated as nonattainment for NO₂, a major stationary source is a stationary source which emits or has the potential to emit 100 tpy or more of NO_X.

7)         For an area designated nonattainment for a pollutant other than those pollutants addressed in subsections (a)(1) through (a)(6) above, a major stationary source is a stationary source which emits or has the potential to emit 100 tpy or more of the pollutant.

8)         For stationary sources locating outside designated nonattainment areas for purposes of Subpart R, a major stationary source is a stationary source which emits or has the potential to emit 100 tpy or more of a regulated NSR pollutant.

b)         Any physical change that occurs at a stationary source which does not qualify under subsection (a) as a major stationary source will be considered a major stationary source, if the change would constitute a major stationary source by itself.

c)         The fugitive emissions of a stationary source shall not be included in determining for any purposes of this Section whether it is a major stationary source, unless the source belongs to one of the following categories of stationary sources:

1)         Coal cleaning plants (with thermal dryers);

2)         Kraft pulp mills;

3)         Portland cement plants;

4)         Primary zinc smelters;

5)         Iron and steel mills;

6)         Primary aluminum ore reduction plants;

7)         Primary copper smelters;

8)         Municipal incinerators capable of charging more than 50 tons of refuse per day;

9)         Hydrofluoric, sulfuric, or nitric acid plants;

10)       Petroleum refineries;

11)       Lime plants;

12)       Phosphate rock processing plants;

13)       Coke oven batteries;

14)       Sulfur recovery plants;

15)       Carbon black plants (furnace process);

16)       Primary lead smelters;

17)       Fuel conversion plants;

18)       Sintering plants;

19)       Secondary metal production plants;

20)       Chemical process plants—The term "chemical processing plant" shall not include ethanol production facilities that produce ethanol by natural fermentation included in NAICS codes 325193 or 312140;

21)       Fossil-fuel boilers (or combination thereof) totaling more than 250 million Btu per hour heat input;

22)       Petroleum storage and transfer units with a total storage capacity exceeding 300,000 barrels;

23)       Taconite ore processing plants;

24)       Glass fiber processing plants;

25)       Charcoal production plants;

26)       Fossil fuel-fired steam electric plants of more than 250 million Btu per hour heat input; and

27)       Any other stationary source categories which, as of August 7, 1980, is being regulated by a standard promulgated under section 111 or 112 of the CAA (42 U.S.C. 7411, 7412), but only with respect to those air pollutants that have been regulated for that category.

(Source:  Added at 49 Ill. Reg. 6237, effective April 23, 2025)