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.