What is the air quality trend in Cardiff?

Over the past 15 days, Cardiff had an average AQI of 45 based on station measurements. The worst day was 2026-07-17 with AQI 70.

How is Cardiff air quality measured?

Air quality in Cardiff 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 Cardiff, United Kingdom

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

155h

PM2.5 Station

155h · 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	54	34–87	15.4 µg/m³	4h	1
2026-07-21	39	33–63	10.0 µg/m³	5h	2
2026-07-20	38	16–56	9.3 µg/m³	7h	1
2026-07-19	37	18–59	9.2 µg/m³	6h	1
2026-07-18	54	26–66	14.9 µg/m³	5h	2
2026-07-17	70	70–70	21.1 µg/m³	1h	1
2026-07-16	43	41–46	10.4 µg/m³	4h	1
2026-07-15	42	38–47	10.1 µg/m³	16h	1
2026-07-14	40	33–54	9.8 µg/m³	14h	1
2026-07-13	38	22–99	10.3 µg/m³	17h	1
2026-07-12	28	20–34	6.7 µg/m³	17h	1
2026-07-11	37	22–55	8.9 µg/m³	18h	1
2026-07-10	54	36–63	14.0 µg/m³	17h	1
2026-07-09	47	26–109	12.9 µg/m³	14h	2
2026-07-08	54	34–71	14.1 µg/m³	10h	3

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