EPA Air · stack tests by state, industry and year

NAICS 9999: stack tests in California, 2024

• 715Stack 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 2024 at a California source whose primary industry code is NAICS 9999. A facility filing more than one industry code is counted under the first one on its record.

NAICS 9999 in California, other years

• 2026 50
• 2025 193
• 2023 322
• 2022 499
• 2021 1,017
• 2020 255
• 2019 290
• 2018 249
• 2017 558

Other industries in California, 2024

• Utilities (NAICS 2211) 10,823
• Pipeline transportation (NAICS 4862) 1,885
• Oil and gas extraction (NAICS 2111) 1,763
• Paper manufacturing (NAICS 3222) 607
• Food manufacturing (NAICS 3111) 459
• Food manufacturing (NAICS 3114) 370
• Food manufacturing (NAICS 3115) 293
• NAICS 4523 288
• Utilities (NAICS 2213) 204
• Waste management and remediation (NAICS 5622) 202
• Nonmetallic mineral product manufacturing (NAICS 3272) 191
• Petroleum and coal products manufacturing (NAICS 3241) 187
• Nonmetallic mineral product manufacturing (NAICS 3279) 133
• Food manufacturing (NAICS 3116) 120
• Beverage and tobacco manufacturing (NAICS 3121) 116
• Merchant wholesalers, nondurable goods (NAICS 4247) 57
• Food manufacturing (NAICS 3119) 52
• National security and international affairs (NAICS 9281) 43
• Animal production (NAICS 1121) 40
• Fabricated metal product manufacturing (NAICS 3324) 38
• Plastics and rubber products manufacturing (NAICS 3261) 36
• Merchant wholesalers, nondurable goods (NAICS 4244) 28
• Chemical manufacturing (NAICS 3251) 25
• Primary metal manufacturing (NAICS 3315) 21
• Mining and quarrying (NAICS 2123) 16
• Pipeline transportation (NAICS 4861) 15
• Hospitals (NAICS 6221) 14
• Fabricated metal product manufacturing (NAICS 3323) 13
• Nonmetallic mineral product manufacturing (NAICS 3273) 11
• Primary metal manufacturing (NAICS 3314) 9
• Educational services (NAICS 6113) 9
• Furniture and related product manufacturing (NAICS 3379) 8
• Waste management and remediation (NAICS 5629) 8
• Chemical manufacturing (NAICS 3253) 6
• Chemical manufacturing (NAICS 3254) 6
• Crop production (NAICS 1113) 6
• Chemical manufacturing (NAICS 3252) 6
• Mining and quarrying (NAICS 2122) 5
• Wood product manufacturing (NAICS 3219) 5
• Professional, scientific and technical services (NAICS 5419) 4
• Primary metal manufacturing (NAICS 3313) 4
• Paper manufacturing (NAICS 3221) 4
• Fabricated metal product manufacturing (NAICS 3321) 4
• Food manufacturing (NAICS 3118) 4
• Agriculture and forestry support (NAICS 1151) 4
• Furniture and related product manufacturing (NAICS 3372) 4
• Administration of environmental programs (NAICS 9241) 4
• Support activities for transportation (NAICS 4881) 3
• Personal and laundry services (NAICS 8129) 3
• Food manufacturing (NAICS 3112) 3
• Computer and electronic product manufacturing (NAICS 3345) 3
• Fabricated metal product manufacturing (NAICS 3328) 3
• Transportation equipment manufacturing (NAICS 3364) 3
• Pipeline transportation (NAICS 4869) 3
• Space research and technology (NAICS 9271) 3

Air-emissions stack tests recorded in California, 2024

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.