What is the air quality trend in Castlereagh?

Over the past 21 days, Castlereagh had an average AQI of 67 based on station measurements. The worst day was 2026-05-20 with AQI 89.

How is Castlereagh air quality measured?

Air quality in Castlereagh 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 Castlereagh, United Kingdom

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

478h

PM2.5 Station

478h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	47	1–154	13.6 µg/m³	22h	4
2026-05-28	58	12–98	16.6 µg/m³	24h	6
2026-05-27	75	11–189	26.5 µg/m³	23h	6
2026-05-26	77	20–215	28.0 µg/m³	24h	5
2026-05-25	76	18–163	25.5 µg/m³	24h	7
2026-05-24	74	20–260	27.7 µg/m³	24h	6
2026-05-23	81	28–183	29.0 µg/m³	24h	6
2026-05-22	57	23–127	16.7 µg/m³	24h	7
2026-05-21	70	15–154	21.6 µg/m³	24h	6
2026-05-20	89	25–182	32.4 µg/m³	24h	6
2026-05-19	83	17–197	31.4 µg/m³	24h	7
2026-05-18	66	21–149	20.2 µg/m³	24h	6
2026-05-17	53	14–167	16.2 µg/m³	24h	6
2026-05-16	68	9–199	26.2 µg/m³	23h	6
2026-05-15	61	16–104	17.4 µg/m³	24h	7
2026-05-14	68	22–219	24.5 µg/m³	24h	7
2026-05-13	65	11–119	19.5 µg/m³	24h	7
2026-05-12	62	12–96	18.6 µg/m³	24h	7
2026-05-11	55	30–81	14.8 µg/m³	24h	8
2026-05-10	76	30–194	31.1 µg/m³	24h	7
2026-05-09	56	55–56	14.2 µg/m³	2h	6

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