EPA Air · stack tests by state, industry and year

NAICS 9999: stack tests in California, 2022

• 499Stack 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 2022 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
• 2024 715
• 2023 322
• 2021 1,017
• 2020 255
• 2019 290
• 2018 249
• 2017 558

Other industries in California, 2022

• Utilities (NAICS 2211) 4,647
• Oil and gas extraction (NAICS 2111) 3,080
• Food manufacturing (NAICS 3114) 291
• Petroleum and coal products manufacturing (NAICS 3241) 271
• Nonmetallic mineral product manufacturing (NAICS 3272) 254
• Utilities (NAICS 2213) 199
• Animal production (NAICS 1121) 188
• Beverage and tobacco manufacturing (NAICS 3121) 184
• Waste management and remediation (NAICS 5622) 167
• Food manufacturing (NAICS 3115) 141
• Justice, public order and safety (NAICS 9221) 100
• Utilities (NAICS 2212) 96
• Food manufacturing (NAICS 3119) 73
• Chemical manufacturing (NAICS 3253) 72
• Executive and legislative government (NAICS 9211) 61
• Plastics and rubber products manufacturing (NAICS 3261) 50
• Pipeline transportation (NAICS 4861) 39
• Merchant wholesalers, nondurable goods (NAICS 4247) 38
• Pipeline transportation (NAICS 4862) 35
• Mining and quarrying (NAICS 2123) 32
• Food manufacturing (NAICS 3111) 32
• Nonmetallic mineral product manufacturing (NAICS 3279) 29
• Food manufacturing (NAICS 3116) 26
• Fabricated metal product manufacturing (NAICS 3324) 25
• Hospitals (NAICS 6221) 20
• Paper manufacturing (NAICS 3222) 18
• Merchant wholesalers, nondurable goods (NAICS 4244) 16
• Nonmetallic mineral product manufacturing (NAICS 3273) 16
• Waste management and remediation (NAICS 5629) 13
• Food manufacturing (NAICS 3118) 9
• Fabricated metal product manufacturing (NAICS 3323) 8
• National security and international affairs (NAICS 9281) 8
• Chemical manufacturing (NAICS 3252) 6
• Educational services (NAICS 6113) 6
• Space research and technology (NAICS 9271) 5
• Fabricated metal product manufacturing (NAICS 3321) 5
• Administration of environmental programs (NAICS 9241) 5
• Electrical equipment and appliance manufacturing (NAICS 3351) 4
• Agriculture and forestry support (NAICS 1151) 4
• Transportation equipment manufacturing (NAICS 3364) 4
• Printing and related support (NAICS 3231) 4
• Ambulatory health care services (NAICS 6216) 3
• Chemical manufacturing (NAICS 3254) 3
• Food manufacturing (NAICS 3112) 3

Air-emissions stack tests recorded in California, 2022

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.