What is the air quality trend in Castlereagh?

Over the past 21 days, Castlereagh had an average AQI of 42 based on station measurements. The worst day was 2026-07-20 with AQI 56.

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

451h

PM2.5 Station

451h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	35	15–57	8.8 µg/m³	3h	3
2026-08-07	36	13–72	8.7 µg/m³	22h	4
2026-08-06	44	16–188	14.5 µg/m³	24h	5
2026-08-05	44	16–105	11.6 µg/m³	24h	4
2026-08-04	46	20–74	11.7 µg/m³	24h	4
2026-08-03	52	26–152	14.0 µg/m³	24h	4
2026-08-02	46	8–166	13.9 µg/m³	22h	4
2026-08-01	45	10–106	12.4 µg/m³	24h	3
2026-07-31	43	13–118	11.7 µg/m³	23h	4
2026-07-30	39	11–137	10.5 µg/m³	22h	4
2026-07-29	44	7–92	11.7 µg/m³	21h	4
2026-07-28	43	13–61	10.8 µg/m³	22h	4
2026-07-27	41	5–91	10.9 µg/m³	24h	3
2026-07-26	38	5–94	9.8 µg/m³	24h	3
2026-07-25	40	20–78	10.0 µg/m³	20h	3
2026-07-24	39	5–93	10.3 µg/m³	21h	2
2026-07-23	37	18–59	9.0 µg/m³	22h	3
2026-07-22	43	13–114	11.4 µg/m³	23h	3
2026-07-21	38	10–70	9.7 µg/m³	21h	4
2026-07-20	56	20–365	24.4 µg/m³	24h	5
2026-07-19	42	22–111	11.1 µg/m³	17h	4

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