EPA Air · stack tests by state, industry and year

Fabricated metal product manufacturing (NAICS 3324): stack tests in Colorado, 2025

• 9Stack 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 Colorado source whose primary industry code is NAICS 3324. A facility filing more than one industry code is counted under the first one on its record.

Fabricated metal product manufacturing (NAICS 3324) in Colorado, other years

• 2024 18
• 2019 7

Other industries in Colorado, 2025

• Oil and gas extraction (NAICS 2111) 286
• Utilities (NAICS 2211) 34
• Pipeline transportation (NAICS 4862) 17
• Nonmetallic mineral product manufacturing (NAICS 3273) 13
• Waste management and remediation (NAICS 5622) 10
• Petroleum and coal products manufacturing (NAICS 3241) 5
• Nonmetallic mineral product manufacturing (NAICS 3272) 5
• Merchant wholesalers, nondurable goods (NAICS 4247) 4
• Food manufacturing (NAICS 3115) 4
• Mining and quarrying (NAICS 2123) 3
• Beverage and tobacco manufacturing (NAICS 3121) 3

Air-emissions stack tests recorded in Colorado, 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.