EPA Air · stack tests by county and year
Air-emissions stack tests in Coconino County, Arizona, 2021
- 3Stack 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 Coconino County, Arizona 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 Coconino County facility page.
Coconino County, Arizona, 2021
- Inspections 14
Air-emissions stack tests in Coconino County, other years
What stands out
- Stack tests in Coconino County, Arizona, held at 3 in both 2020, the previous year on file, and 2021.
- The county’s file for stack tests holds 4 years of events, from 2020 through 2023.
- Its 3 stack tests rank 7th of the 10 county cells in Arizona for 2021.
- Its 3 stack tests are 3.2% of the 93 the state’s file holds for 2021.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Coconino County, Arizona, 2021
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2021-08-24 | EL PASO NATURAL GAS CO - WILLIAMS COMPRESSOR STATION | Pass | State |
| 2021-04-06 | TRANSWESTERN PIPELINE - FLAGSTAFF COMPRESSOR STATION | Pass | State |
| 2021-03-18 | EL PASO NATURAL GAS CO - WILLIAMS COMPRESSOR STATION | Pass | State |
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 Coconino county, AZ, in 2021. The stack tests recorded in 2021 are 3.