EPA Air · stack tests by state, industry and year

National security and international affairs (NAICS 9281): stack tests in Pennsylvania, 2026

• 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 2026 at a Pennsylvania source whose primary industry code is NAICS 9281. A facility filing more than one industry code is counted under the first one on its record.

National security and international affairs (NAICS 9281) in Pennsylvania, other years

• 2025 3
• 2024 4
• 2023 7
• 2022 7
• 2021 11
• 2020 3
• 2019 4
• 2018 7
• 2017 3

Other industries in Pennsylvania, 2026

• Oil and gas extraction (NAICS 2111) 291
• Mining support (NAICS 2131) 35
• Pipeline transportation (NAICS 4862) 31
• Utilities (NAICS 2211) 23
• Educational services (NAICS 6113) 9
• Chemical manufacturing (NAICS 3251) 8
• Waste management and remediation (NAICS 5622) 7
• Primary metal manufacturing (NAICS 3311) 7
• Merchant wholesalers, nondurable goods (NAICS 4247) 5
• Utilities (NAICS 2213) 5
• Chemical manufacturing (NAICS 3254) 5
• Petroleum and coal products manufacturing (NAICS 3241) 5
• Nonmetallic mineral product manufacturing (NAICS 3274) 4
• Nonmetallic mineral product manufacturing (NAICS 3273) 4
• Paper manufacturing (NAICS 3221) 4
• Primary metal manufacturing (NAICS 3315) 4
• Administration of environmental programs (NAICS 9241) 4
• Plastics and rubber products manufacturing (NAICS 3261) 3
• Mining and quarrying (NAICS 2121) 3
• Hospitals (NAICS 6221) 3

Air-emissions stack tests recorded in Pennsylvania, 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.