SmogRank / World / Europe / Portugal / Leiria
Most polluted cities in Leiria, Portugal
No city in Leiria, Portugal has enough readings to rank for the last 24 hours.
A city joins the 24-hour ranking with 18 hours of readings in the last 24; none here has that right now, so there is nothing to map or chart.
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Estimated: cities without a monitor
Leiria 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 |
|---|---|
| Leiria | ≈ 5 µg/m³ |
| Marinha Grande | ≈ 5 µg/m³ |
| Caldas da Rainha | ≈ 6 µg/m³ |
| Pombal | ≈ 5 µg/m³ |
| Alcobaça | ≈ 5 µg/m³ |
| Peniche | ≈ 5 µg/m³ |
Updated 2026-10-05 02:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.