EPA Air · stack tests by county and year

Air-emissions stack tests in Mills County, Iowa, 2021

• 4Stack 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 Mills County, Iowa during 2021. 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 Mills County facility page.

Air-emissions stack tests in Mills County, other years

• 2025 3
• 2019 4
• 2017 6

Air-emissions stack tests recorded in Mills County, Iowa, 2021

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