EPA Air · stack tests by county, year by year

Air-emissions stack tests in DuPage County, Illinois, year by year

• 70Stack tests

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

DuPage County, Illinois, by year

• 2025 13
• 2024 17
• 2023 6
• 2022 7
• 2021 6
• 2020 5
• 2019 7
• 2018 6
• 2017 3

All sources in DuPage County →

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