EPA Air · stack tests by county and year
Air-emissions stack tests in Navajo County, Arizona, 2025
- 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 Navajo County, Arizona during 2025. 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 Navajo County facility page.
Navajo County, Arizona, 2025
- Inspections 14
Air-emissions stack tests in Navajo County, other years
Air-emissions stack tests recorded in Navajo County, Arizona, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-09-10 | NOVO BIOPOWER, LLC | Pass | State |
| 2025-06-04 | NOVO BIOPOWER, LLC | Pass | State |
| 2025-01-29 | CHOLLA GENERATING STATION | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.