EPA Air · stack tests by county and year

Air-emissions stack tests in Pima County, Arizona, 2025

• 3Stack 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 Pima County, Arizona 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 Pima County facility page.

Pima County, Arizona, 2025

• Inspections 5

Air-emissions stack tests in Pima County, other years

• 2024 7
• 2023 8
• 2022 13
• 2021 15
• 2020 10
• 2019 6
• 2018 3
• 2017 5

Air-emissions stack tests recorded in Pima County, Arizona, 2025

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