IL SB1854

Establishes regulations for "nonnegligible ethylene oxide emissions sources" defined as facilities permitted by the Agency emitting over 150 pounds of ethylene oxide annually (based on 2017 Toxic Release Inventory) located in counties with populations of at least 700,000, excluding ethylene oxide sterilization facilities and hospitals.

Requires affected facilities to submit a continuous emissions monitoring plan to the Agency for approval within 180 days, specifying collection locations, equipment, and system components, with owners having 3 business days to accept conditions or correct deficiencies.

Mandates dispersion modeling using EPA methodologies with zero background ambient ethylene oxide levels, 5 years of meteorological data, and receptor grids extending at least 1 kilometer from the facility with specified spacing requirements.

Requires affected facilities to obtain Agency permits consistent with these requirements 180 days after the effective date to conduct activities resulting in ethylene oxide emissions.

Directs the Agency to impose site-specific annual emissions caps in permits designed to protect public health and include provisions allowing permit reopening if emissions pose a risk to public health.