What is the air quality trend in Belfast?

Over the past 15 days, Belfast had an average AQI of 49 based on station measurements. The worst day was 2026-07-16 with AQI 61.

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

330h

PM2.5 Station

330h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	39	23–56	9.5 µg/m³	7h	4
2026-07-21	43	20–97	11.2 µg/m³	24h	5
2026-07-20	47	13–167	13.9 µg/m³	24h	5
2026-07-19	48	21–162	13.6 µg/m³	24h	4
2026-07-18	53	20–124	14.9 µg/m³	24h	5
2026-07-17	58	25–182	19.1 µg/m³	24h	4
2026-07-16	61	37–105	17.2 µg/m³	23h	4
2026-07-15	55	22–117	15.1 µg/m³	23h	4
2026-07-14	48	14–134	13.3 µg/m³	24h	4
2026-07-13	49	17–225	17.6 µg/m³	24h	5
2026-07-12	53	17–198	20.4 µg/m³	24h	3
2026-07-11	52	14–243	19.0 µg/m³	24h	4
2026-07-10	50	23–112	13.3 µg/m³	22h	3
2026-07-09	44	11–72	11.0 µg/m³	22h	3
2026-07-08	43	15–158	12.4 µg/m³	17h	4

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