35 Ill. Adm. Code 203.601
Lowest Achievable Emission Rate Compliance Requirement
Section 203
Section 203.601 Lowest
Achievable Emission Rate Compliance Requirement
No person shall cause or allow
the operation of a new major stationary source or major modification subject to
the requirements of Subpart C, except as in compliance with applicable LAER
provisions established pursuant to Section 203.301 for such source or
modification.