TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE B: AIR POLLUTION
CHAPTER I: POLLUTION CONTROL BOARD
SUBCHAPTER a: PERMITS AND GENERAL PROVISIONS
PART 203 MAJOR STATIONARY SOURCES CONSTRUCTION AND MODIFICATION
SECTION 203.2510 CRITERIA

 

Section 203.2510  Criteria

 

For this Subpart, the emissions from a new major stationary source or major modification will be considered to cause or contribute to a violation of a NAAQS if such source or modification would exceed the following significance levels at any locality that does not or would not meet the applicable NAAQS.

 

Pollutant

Significant Level (μg/m3)

 

Annual Average

24-hour Average

8-hour Average

3-hour Average

1-hour Average

 

 

 

 

 

 

SO2

1.0

5

 

25

 

PM10

1.0

5

 

 

 

PM2.5

0.3

1.2

 

 

 

NO2

1.0

 

 

 

 

CO

 

 

500

 

2,000

 

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