What is the air quality trend in Barreiro?

Over the past 15 days, Barreiro had an average AQI of 26 based on station measurements. The worst day was 2026-05-24 with AQI 44.

How is Barreiro air quality measured?

Air quality in Barreiro 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 Barreiro, Portugal

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

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

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

318h

PM2.5 Station

318h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	31	24–38	7.3 µg/m³	19h	4
2026-05-29	35	26–52	8.3 µg/m³	24h	4
2026-05-28	37	27–57	9.0 µg/m³	24h	4
2026-05-27	30	20–41	7.1 µg/m³	24h	4
2026-05-26	38	21–55	9.1 µg/m³	24h	4
2026-05-25	33	21–48	8.0 µg/m³	24h	4
2026-05-24	44	35–59	10.6 µg/m³	24h	4
2026-05-23	30	8–47	7.2 µg/m³	24h	4
2026-05-22	33	2–54	7.9 µg/m³	22h	3
2026-05-21	23	5–46	5.5 µg/m³	24h	3
2026-05-20	18	5–46	4.4 µg/m³	21h	2
2026-05-19	18	8–37	4.3 µg/m³	21h	2
2026-05-18	14	4–59	3.5 µg/m³	22h	2
2026-05-17	12	4–24	2.8 µg/m³	20h	2
2026-05-16	8	8–8	1.9 µg/m³	1h	1

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