What is the air quality trend in Caldas da Rainha?

Over the past 21 days, Caldas da Rainha had an average AQI of 31 based on station measurements. The worst day was 2026-07-21 with AQI 53.

How is Caldas da Rainha air quality measured?

Air quality in Caldas da Rainha 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 Caldas da Rainha, Portugal

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

Historical PM2.5 and AQI trend from monitoring stations near Caldas da Rainha, Portugal.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

226h

PM2.5 Station

226h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	20	16–25	4.9 µg/m³	4h	1
2026-07-21	53	14–119	15.5 µg/m³	11h	1
2026-07-20	48	3–76	13.3 µg/m³	6h	1
2026-07-19	27	5–53	6.5 µg/m³	10h	1
2026-07-18	46	11–97	13.8 µg/m³	7h	1
2026-07-17	30	12–53	7.1 µg/m³	7h	1
2026-07-16	36	14–74	9.1 µg/m³	11h	1
2026-07-15	44	22–55	10.6 µg/m³	9h	1
2026-07-14	40	10–65	10.1 µg/m³	11h	1
2026-07-13	36	12–72	9.1 µg/m³	12h	1
2026-07-12	31	17–49	7.6 µg/m³	13h	1
2026-07-11	36	9–53	8.7 µg/m³	13h	1
2026-07-10	30	8–53	7.2 µg/m³	15h	1
2026-07-09	22	9–38	5.4 µg/m³	11h	1
2026-07-08	30	14–50	7.3 µg/m³	13h	1
2026-07-07	27	8–81	7.5 µg/m³	13h	1
2026-07-06	20	8–29	4.9 µg/m³	6h	1
2026-07-05	24	5–87	6.4 µg/m³	13h	1
2026-07-04	26	1–55	6.4 µg/m³	16h	1
2026-07-03	21	7–48	5.0 µg/m³	19h	1
2026-07-02	14	5–21	3.4 µg/m³	6h	1

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