What is the air quality trend in Belfast?

Over the past 15 days, Belfast had an average AQI of 43 based on station measurements. The worst day was 2026-08-03 with AQI 58.

How is Belfast air quality measured?

Air quality in Belfast 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 Belfast, United Kingdom

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

Historical PM2.5 and AQI trend from monitoring stations near Belfast, United Kingdom.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

312h

PM2.5 Station

312h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	44	17–70	12.2 µg/m³	6h	3
2026-08-07	42	13–97	11.6 µg/m³	22h	3
2026-08-06	40	12–117	10.6 µg/m³	23h	4
2026-08-05	40	13–96	10.4 µg/m³	24h	3
2026-08-04	50	21–169	14.8 µg/m³	21h	4
2026-08-03	58	27–157	16.6 µg/m³	22h	4
2026-08-02	42	8–132	11.2 µg/m³	23h	3
2026-08-01	44	16–90	11.6 µg/m³	23h	4
2026-07-31	41	16–82	10.4 µg/m³	24h	3
2026-07-30	35	18–57	8.6 µg/m³	21h	3
2026-07-29	42	4–109	10.8 µg/m³	20h	4
2026-07-28	47	15–86	12.4 µg/m³	23h	4
2026-07-27	38	10–74	9.9 µg/m³	22h	3
2026-07-26	37	11–66	9.2 µg/m³	23h	3
2026-07-25	46	14–152	12.7 µg/m³	15h	3

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