SmogRank / Countries / Puerto Rico
Most polluted cities in Puerto Rico
1 measured city ranked by PM2.5, last 30 days. Worst: Cataño at 10.5 µg/m³, #371 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Cataño Cataño | 10.5 |
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
Estimated: cities without a monitor
Puerto Rico cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| San Juan estimated | ≈ 6 µg/m³ |
| Bayamón estimated | ≈ 6 µg/m³ |
| Carolina estimated | ≈ 6 µg/m³ |
| Ponce estimated | ≈ 6 µg/m³ |
| Arecibo estimated | ≈ 5 µg/m³ |
| Caguas estimated | ≈ 6 µg/m³ |
| Guaynabo estimated | ≈ 6 µg/m³ |
| Trujillo Alto estimated | ≈ 6 µg/m³ |
| Mayagüez estimated | ≈ 6 µg/m³ |
| Fajardo estimated | ≈ 7 µg/m³ |
| Levittown estimated | ≈ 6 µg/m³ |
| Vega Baja estimated | ≈ 6 µg/m³ |
| Barceloneta estimated | ≈ 6 µg/m³ |
| Guayama estimated | ≈ 7 µg/m³ |
| Humacao estimated | ≈ 7 µg/m³ |
| Yauco estimated | ≈ 6 µg/m³ |
| Cayey estimated | ≈ 7 µg/m³ |
| Candelaria estimated | ≈ 6 µg/m³ |
| Manatí estimated | ≈ 6 µg/m³ |
| Aguadilla estimated | ≈ 6 µg/m³ |
Updated 2026-10-01 06:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.