EPA Air · stack tests by state, industry and year

Oil and gas extraction (NAICS 2111): stack tests in Montana, 2023

• 11Stack 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 2023 at a Montana source whose primary industry code is NAICS 2111. A facility filing more than one industry code is counted under the first one on its record.

Oil and gas extraction (NAICS 2111) in Montana, other years

• 2025 12
• 2024 14
• 2022 14
• 2021 20
• 2020 28
• 2019 28
• 2018 36
• 2017 39

Other industries in Montana, 2023

• Utilities (NAICS 2211) 61
• Petroleum and coal products manufacturing (NAICS 3241) 53
• Pipeline transportation (NAICS 4862) 21
• Nonmetallic mineral product manufacturing (NAICS 3273) 6
• Wood product manufacturing (NAICS 3212) 6
• Chemical manufacturing (NAICS 3251) 5
• Primary metal manufacturing (NAICS 3314) 3

Air-emissions stack tests recorded in Montana, 2023

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.