Right now
The most recent data we hold from AIRNOW arrived 24 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
Reported by AIRNOW 20 days ago.
It is the 23rd strongest of the 59 detections recorded within 20 km of this point since 20 March 2026. The last comparable one was on 20 August 2026.
What the source measured
AIRNOW reported: AQI: 103 (Unhealthy for Sensitive Groups) · PM2.5 AQI: 55 · Ozone AQI: 42
Nearby, since 20 March 2026
- August 26, 2026 · score 14 · 0.0 km
- August 11, 2026 · score 14 · 0.0 km
How we know
One source: AIRNOW. Not yet confirmed by a second, independent source.
Our own score for this event is 14 out of 100, at 50 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Air Quality |
| Severity | Low |
| Calamity Score (ours) | 14 / 100 |
| Our confidence | 50% |
| Coordinates | 39.9003, -105.0420 |
| Timestamp | 2026-08-21T00:00:00.000Z |
| Source | https://www.airnow.gov/ |
Score Breakdown
Technical Details
| Aqi | 103 |
| Pm25Aqi | 55 |
| OzoneAqi | 42 |
| CategoryName | Unhealthy for Sensitive Groups |
| ReportingArea | Denver-Boulder |
| StateCode | CO |
| City | Denver |
Safety Information
When air quality is hazardous: stay indoors with windows closed, and run a filtered air purifier if you have one. Avoid outdoor exercise. Children, older adults and anyone with heart or lung conditions are affected first and worst — an N95 respirator helps outdoors, a cloth mask does not.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
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