35 Ill. Adm. Code 203.134
Secondary Emissions
Section 203
Section 203.134 Secondary
Emissions
"Secondary Emissions"
means the emissions which 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. For the purpose
of this Part, secondary emissions must be specific, well defined, quantifiable,
and impact the same general area as the stationary source or modification which
causes the secondary emissions. Secondary emissions may include, but are not
limited to, emissions from any off-site support facility which would not
otherwise be constructed or increase its emissions except as a result of the
construction or operation of the major stationary source or major modification.