EPA Air · stack tests by state, industry and year

Mining and quarrying (NAICS 2121): stack tests in Illinois, 2025

• 30Stack 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 2025 at a Illinois source whose primary industry code is NAICS 2121. A facility filing more than one industry code is counted under the first one on its record.

Mining and quarrying (NAICS 2121) in Illinois, other years

• 2026 29
• 2024 24
• 2021 3
• 2018 3

Other industries in Illinois, 2025

• Utilities (NAICS 2211) 65
• Pipeline transportation (NAICS 4862) 24
• Primary metal manufacturing (NAICS 3315) 22
• Hospitals (NAICS 6221) 19
• Plastics and rubber products manufacturing (NAICS 3261) 9
• Mining and quarrying (NAICS 2123) 9
• Petroleum and coal products manufacturing (NAICS 3241) 9
• Waste management and remediation (NAICS 5622) 8
• Nonmetallic mineral product manufacturing (NAICS 3273) 8
• Paper manufacturing (NAICS 3222) 7
• Miscellaneous manufacturing (NAICS 3399) 7
• Utilities (NAICS 2212) 7
• Merchant wholesalers, nondurable goods (NAICS 4247) 5
• Executive and legislative government (NAICS 9211) 5
• Chemical manufacturing (NAICS 3251) 4
• Food manufacturing (NAICS 3112) 3
• Amusement, gambling and recreation (NAICS 7132) 3
• Chemical manufacturing (NAICS 3259) 3

Air-emissions stack tests recorded in Illinois, 2025

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.