EPA Air · stack tests by state, industry and year

Mining and quarrying (NAICS 2123): stack tests in Illinois, 2026

• 25Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row is one stack test recorded during 2026 at a Illinois source whose primary industry code is NAICS 2123. A facility filing more than one industry code is counted under the first one on its record.

Mining and quarrying (NAICS 2123) in Illinois, other years

• 2025 9
• 2022 4
• 2021 5
• 2019 5
• 2018 5

Other industries in Illinois, 2026

• Utilities (NAICS 2211) 37
• Mining and quarrying (NAICS 2121) 29
• Food manufacturing (NAICS 3112) 14
• Petroleum and coal products manufacturing (NAICS 3241) 11
• Electrical equipment and appliance manufacturing (NAICS 3359) 10
• Pipeline transportation (NAICS 4862) 8
• Primary metal manufacturing (NAICS 3315) 5
• Waste management and remediation (NAICS 5622) 5
• Nonmetallic mineral product manufacturing (NAICS 3273) 5
• Oil and gas extraction (NAICS 2111) 4
• Hospitals (NAICS 6221) 4
• Utilities (NAICS 2212) 3

Air-emissions stack tests recorded in Illinois, 2026

Primary NAICS code as filed on the facility record; dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.