What is the air quality trend in Ribeira de Frades?

Over the past 13 days, Ribeira de Frades had an average AQI of 25 based on station measurements. The worst day was 2026-05-28 with AQI 47.

How is Ribeira de Frades air quality measured?

Air quality in Ribeira de Frades 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 Ribeira de Frades, Portugal

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

Historical PM2.5 and AQI trend from monitoring stations near Ribeira de Frades, Portugal.

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

190h

PM2.5 Station

190h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-30	29	29–29	7.0 µg/m³	25.5	4h	1
2026-05-29	30	25–38	7.3 µg/m³	24.5	19h	1
2026-05-28	47	42–53	11.2 µg/m³	34.4	19h	1
2026-05-27	46	33–53	11.0 µg/m³	43.1	18h	1
2026-05-26	31	29–33	7.6 µg/m³	30.3	15h	1
2026-05-25	31	25–38	7.6 µg/m³	30.8	18h	1
2026-05-24	22	21–25	5.4 µg/m³	31.2	19h	1
2026-05-23	25	21–29	5.9 µg/m³	29.3	18h	1
2026-05-22	25	4–33	6.1 µg/m³	29.0	15h	1
2026-05-21	15	12–17	3.6 µg/m³	49.8	5h	1
2026-05-20	12	12–12	3.0 µg/m³	48.8	18h	1
2026-05-19	10	8–12	2.4 µg/m³	13.4	17h	1
2026-05-18	9	8–12	2.2 µg/m³	14.4	5h	1

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