EPA Air · stack tests by county and year

Air-emissions stack tests in Glacier County, Montana, 2025

• 22Stack 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 Glacier County, Montana 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 Glacier County facility page.

Air-emissions stack tests in Glacier County, other years

• 2026 6
• 2024 14
• 2023 11
• 2022 12
• 2021 20
• 2020 12
• 2019 12
• 2018 13
• 2017 26

Air-emissions stack tests recorded in Glacier County, Montana, 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 Glacier county, MT, for 2025. It lists 22 stack tests recorded in 2025.