Right now
The most recent data we hold from World Air Quality Index arrived 36 minutes ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
Reported by World Air Quality Index today.
It is one of only 4 we have recorded within 20 km of this point since 20 June 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
World Air Quality Index reported: AQI 173 (Unhealthy) at Guarulhos-Paço Municipal, São Paulo, Brazil
The air quality index read 173 (Unhealthy) at the Guarulhos-Paço Municipal, São Paulo, Brazil station.
Urban PEI: 682,092 within a heuristic 5 km radius; not unique people.
Nearby, since 20 June 2026
- September 25, 2026 · score 55 · 0.0 km
- September 4, 2026 · 0.0 km
- September 26, 2026 · score 59 · 13.4 km
How we know
One source: World Air Quality Index. Not yet confirmed by a second, independent source.
Our own score for this event is 55 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 | Medium |
| Calamity Score (ours) | 55 / 100 |
| Legacy data-support index | 0.68/1 |
| Coordinates | -23.4555, -46.5185 |
| Nearest City | Guarulhos (1 km) |
| Urban exposure index (PEI) | 682.1K within 5 km |
| Impact Tier | significant |
| Timestamp | 2026-09-26T07:00:00.000Z |
| Source | https://aqicn.org/city/@343 |
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: waqi. Occurrence: 2026-09-26T07:00:00.000Z.
First archived: 2026-09-26T03:56:44.390Z. Material modification: 2026-09-26T08:02:11.880Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-26T08:02:11.880Z · data_change
Index 55 → 55; severity medium → medium; version 5 → 5.
2026-09-26T07:03:15.137Z · data_change
Index 55 → 55; severity medium → medium; version 5 → 5.
2026-09-26T05:00:48.407Z · data_change
Index 55 → 55; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Aqi | 173 |
| AqiCategory | Unhealthy |
| StationName | Guarulhos-Paço Municipal, São Paulo, Brazil |
| StationUid | 343 |
| Network | official |
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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