EPA Air · by county
Air-emissions sources in Cook County, Illinois
- 4,231Facilities
Every stationary source in Cook County, Illinois that holds a Clean Air Act permit or is otherwise tracked by an air agency — planned, under construction, operating, seasonal or temporarily closed. Sources EPA records as permanently closed are not listed.
Every source’s record in Cook County
Each of the 4,195 operating major, synthetic minor and minor sources in Cook County, Illinois has a record page: every source in Cook County, A to Z.
By emissions classification in Cook County
A source’s classification is the size band its potential emissions put it in: a major source is large enough to need a Title V operating permit, a synthetic minor has accepted limits to stay below that line, and a minor source sits below it outright.
- Minor source 4,043
- Major source 80
- Synthetic minor source 72
Inspections in Cook County, by year
A compliance evaluation is the on-site or file review a state, local or federal air agency records against a permitted source.
- 2026 inspections 80
- 2025 inspections 167
- 2024 inspections 161
- 2023 inspections 128
- 2022 inspections 154
- 2021 inspections 212
- 2020 inspections 135
- 2019 inspections 96
- 2018 inspections 93
- 2017 inspections 141
Violations in Cook County, by year
A high-priority violation is the most serious class of Clean Air Act non-compliance an agency records against a source; a federally reportable violation is the next step down in severity.
- 2026 violations 25
- 2025 violations 24
- 2024 violations 34
- 2023 violations 32
- 2022 violations 28
- 2021 violations 52
- 2020 violations 25
- 2019 violations 28
- 2018 violations 17
- 2017 violations 41
Stack tests in Cook County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 6
- 2025 stack tests 18
- 2024 stack tests 14
- 2023 stack tests 25
- 2022 stack tests 25
- 2021 stack tests 20
- 2020 stack tests 19
- 2019 stack tests 17
- 2018 stack tests 13
- 2017 stack tests 20
Inspections in Cook County, year by year · Violations in Cook County, year by year · Stack tests in Cook County, year by year
Other counties in Illinois
Every county in the state with at least three sources on file.
- Bureau County 63
- Calhoun County 8
- Carroll County 52
- Cass County 30
- Champaign County 266
- Christian County 68
- Clark County 38
- Clay County 50
- Clinton County 79
- Coles County 99
- Crawford County 42
- Cumberland County 17
- De Witt County 43
- DeKalb County 107
- Douglas County 50
- DuPage County 918
- Edgar County 52
- Edwards County 16
- Effingham County 99
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register for Cook county, IL. It lists 4,231 facilities and 80 major sources.