EPA Air · stack tests by state, industry and year

Hospitals (NAICS 6221): stack tests in Iowa, 2025

• 5Stack 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 Iowa source whose primary industry code is NAICS 6221. A facility filing more than one industry code is counted under the first one on its record.

Hospitals (NAICS 6221) in Iowa, other years

• 2022 4

Other industries in Iowa, 2025

• Chemical manufacturing (NAICS 3251) 171
• Utilities (NAICS 2211) 110
• Food manufacturing (NAICS 3112) 49
• Primary metal manufacturing (NAICS 3311) 12
• Utilities (NAICS 2213) 11
• Chemical manufacturing (NAICS 3259) 10
• Primary metal manufacturing (NAICS 3313) 9
• Pipeline transportation (NAICS 4862) 9
• Food manufacturing (NAICS 3111) 9
• Data processing and hosting (NAICS 5182) 9
• Nonmetallic mineral product manufacturing (NAICS 3274) 8
• Primary metal manufacturing (NAICS 3315) 8
• Chemical manufacturing (NAICS 3253) 8
• Publishing industries (NAICS 5112) 6
• Machinery manufacturing (NAICS 3331) 6
• Professional, scientific and technical services (NAICS 5419) 6
• Nonmetallic mineral product manufacturing (NAICS 3273) 6
• Mining and quarrying (NAICS 2123) 5
• Agriculture and forestry support (NAICS 1151) 5
• Food manufacturing (NAICS 3116) 4
• Petroleum and coal products manufacturing (NAICS 3241) 3
• Nonmetallic mineral product manufacturing (NAICS 3279) 3
• Justice, public order and safety (NAICS 9221) 3

Air-emissions stack tests recorded in Iowa, 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.