What is the air quality trend in Belfast?

Over the past 15 days, Belfast had an average AQI of 72 based on station measurements. The worst day was 2026-05-20 with AQI 88.

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

331h

PM2.5 Station

331h · 5 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	58	21–202	21.6 µg/m³	17h	5
2026-05-28	62	29–158	18.5 µg/m³	23h	6
2026-05-27	75	26–181	26.7 µg/m³	24h	5
2026-05-26	73	22–116	22.7 µg/m³	24h	5
2026-05-25	80	19–177	28.0 µg/m³	24h	7
2026-05-24	78	32–193	28.1 µg/m³	24h	5
2026-05-23	82	40–173	28.4 µg/m³	24h	5
2026-05-22	62	26–105	18.2 µg/m³	24h	6
2026-05-21	67	22–152	20.3 µg/m³	24h	5
2026-05-20	88	20–220	37.8 µg/m³	24h	6
2026-05-19	79	24–154	26.1 µg/m³	24h	6
2026-05-18	65	18–153	19.8 µg/m³	24h	6
2026-05-17	78	23–174	27.4 µg/m³	23h	7
2026-05-16	70	10–191	26.4 µg/m³	23h	6
2026-05-15	63	40–81	18.6 µg/m³	5h	8

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