EPA Air · stack tests by county, year by year

Air-emissions stack tests in O'Brien County, Iowa, year by year

• 47Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every year on record for O'Brien County, Iowa, most recent first. Each year page lists the events recorded at sources in the county that year.

O'Brien County, Iowa, by year

• 2025 5
• 2024 7
• 2023 7
• 2022 5
• 2021 5
• 2020 4
• 2019 6
• 2018 5
• 2017 3

All sources in O'Brien County →

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