What is the air quality trend in Leiria?

Over the past 14 days, Leiria had an average AQI of 29 based on station measurements. The worst day was 2026-05-27 with AQI 44.

How is Leiria air quality measured?

Air quality in Leiria is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Leiria, Portugal

Name: Leiria Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Leiria, Portugal.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

238h

PM2.5 Station

238h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	37	25–51	8.8 µg/m³	10h	1
2026-05-29	33	20–57	7.9 µg/m³	20h	2
2026-05-28	42	23–53	10.0 µg/m³	21h	1
2026-05-27	44	33–53	10.7 µg/m³	18h	1
2026-05-26	40	27–72	9.8 µg/m³	19h	1
2026-05-25	33	26–53	8.0 µg/m³	20h	1
2026-05-24	26	12–45	6.2 µg/m³	20h	2
2026-05-23	29	18–42	7.0 µg/m³	19h	2
2026-05-22	31	4–53	7.5 µg/m³	19h	1
2026-05-21	24	11–55	5.8 µg/m³	12h	1
2026-05-20	19	11–40	4.6 µg/m³	22h	1
2026-05-19	12	8–24	3.0 µg/m³	18h	1
2026-05-18	24	8–57	5.8 µg/m³	15h	1
2026-05-17	21	11–38	5.1 µg/m³	5h	1

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