Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 204 - PREVENTION OF SIGNIFICANT DETERIORATION
Subpart B - DEFINITIONS
Section 204.260 - Baseline Concentration
Universal Citation: 35 IL Admin Code ยง 204.260
Current through Register Vol. 48, No. 38, September 20, 2024
a) "Baseline concentration" means the ambient concentration level that exists in the baseline area at the time of the applicable minor source baseline date. A baseline concentration is determined for each pollutant for which a minor source baseline date is established and shall include:
1) The actual emissions, as defined in
Section 204.210, representative of sources in existence on the applicable minor
source baseline date, except as provided in subsection (b); and
2) The allowable emissions of major
stationary sources that commenced construction before the major source baseline
date, but were not in operation by the applicable minor source baseline
date.
b) The following will not be included in the baseline concentration and will affect the applicable maximum allowable increase or increases:
1) Actual emissions, as defined in Section
204.210, from any major stationary source on which construction commenced after
the major source baseline date. For a major stationary source in existence on
the major source baseline date, "actual emissions" for the purposes of this
subsection (b) means increases or decreases in actual emissions resulting from
construction commencing after the major source baseline date; and
2) Actual emissions increases and decreases,
as defined in Section 204.210, at any stationary source occurring after the
minor source baseline date.
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