Right now
The most recent data we hold from AIRNOW arrived 75 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
4 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
Reported by AIRNOW today.
No stronger detection stands among the 22 recorded within 20 km of this point since 21 April 2026 — 4 others scored the same. The last comparable one was on 28 August 2026. 4 more were recorded here in the fortnight before it.
What the source measured
AIRNOW reported: AQI: 111 (Unhealthy for Sensitive Groups) · PM2.5 AQI: 111 · Ozone AQI: 13
Urban PEI: 1,012,603 within a heuristic 5 km radius; not unique people.
Nearby, since 21 April 2026
- September 16, 2026 · score 50 · 0.0 km
How we know
One source: AIRNOW. Not yet confirmed by a second, independent source.
Our own score for this event is 50 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Air Quality |
| Severity | Low |
| Calamity Score (ours) | 50 / 100 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 29.4170, -98.4840 |
| Nearest City | San Antonio (1 km) |
| Urban exposure index (PEI) | 1.0M within 5 km |
| Impact Tier | minor |
| Timestamp | 2026-09-16T00:00:00.000Z |
| Source | https://www.airnow.gov/ |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: airnow. Occurrence: 2026-09-16T00:00:00.000Z.
First archived: 2026-04-28T22:20:05.017Z. Material modification: 2026-09-16T11:24:23.716Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-16T11:24:23.716Z · model_change
Index 14 → 50; severity low → low; version 1 → 5.
Score Breakdown
Technical Details
| Aqi | 111 |
| Pm25Aqi | 111 |
| OzoneAqi | 13 |
| CategoryName | Unhealthy for Sensitive Groups |
| ReportingArea | San Antonio |
| StateCode | TX |
| City | San Antonio |
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.
Review the area, threshold and delivery channel in your account.
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