EPA Air · stack tests by county and year

Air-emissions stack tests in Fresno County, California, 2025

• 211Stack 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 Fresno County, California during 2025. 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 Fresno County facility page.

Fresno County, California, 2025

• Inspections 262

Air-emissions stack tests in Fresno County, other years

• 2024 597
• 2023 1,186
• 2022 1,831
• 2021 4,644
• 2020 2,425
• 2019 1,305
• 2018 927
• 2017 1,089

Air-emissions stack tests recorded in Fresno County, California, 2025

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 Fresno county, CA, in 2025. It lists 211 stack tests recorded in 2025.