EPA Air · stack tests by county, year by year

Air-emissions stack tests in Johnston County, Oklahoma, year by year

• 4Stack tests

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

Johnston County, Oklahoma, by year

• 2024 4

All sources in Johnston County →

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