EPA Air · stack tests by county and year

Air-emissions stack tests in Orange County, California, 2023

• 70Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Orange County, California during 2023. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Orange County facility page.

Orange County, California, 2023

• Inspections 39

Air-emissions stack tests in Orange County, other years

• 2026 4
• 2025 10
• 2024 35
• 2022 22
• 2021 19
• 2020 58
• 2019 65
• 2018 61
• 2017 31

Air-emissions stack tests recorded in Orange County, California, 2023

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.

What this page shows

This page covers Clean Air Act facilities in the EPA air register with stack tests in Orange, CA, in 2023. It lists 70 stack tests recorded in 2023.