EPA Air · stack tests by county and year
Air-emissions stack tests in Boulder County, Colorado, 2026
- 7Stack 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 Boulder County, Colorado during 2026. 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 Boulder County facility page.
Boulder County, Colorado, 2026
Air-emissions stack tests in Boulder County, other years
Air-emissions stack tests recorded in Boulder County, Colorado, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-08-17 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | N/A | State |
| 2026-04-14 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | Pass | State |
| 2026-04-13 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | Pass | State |
| 2026-04-13 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | Pass | State |
| 2026-04-09 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | Pass | State |
| 2026-04-09 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | Pass | State |
| 2026-04-07 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.