What is the air quality trend in Welwyn Garden City?

Over the past 15 days, Welwyn Garden City had an average AQI of 49 based on station measurements. The worst day was 2026-07-16 with AQI 60.

How is Welwyn Garden City air quality measured?

Air quality in Welwyn Garden City 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 Welwyn Garden City, United Kingdom

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

Historical PM2.5 and AQI trend from monitoring stations near Welwyn Garden City, United Kingdom.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

337h

PM2.5 Station

337h · 18 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	39	24–55	9.4 µg/m³	6.6	5h	25
2026-07-21	39	27–53	9.3 µg/m³	9.8	24h	34
2026-07-20	41	26–152	10.8 µg/m³	11.0	24h	30
2026-07-19	38	25–68	9.4 µg/m³	8.5	24h	30
2026-07-18	52	35–73	13.3 µg/m³	16.8	24h	30
2026-07-17	58	42–73	15.8 µg/m³	23.6	24h	29
2026-07-16	60	45–134	16.6 µg/m³	18.6	24h	29
2026-07-15	55	40–107	14.3 µg/m³	17.8	24h	27
2026-07-14	52	40–74	13.1 µg/m³	14.9	24h	28
2026-07-13	45	31–63	11.1 µg/m³	12.6	24h	28
2026-07-12	58	29–121	16.7 µg/m³	9.8	24h	26
2026-07-11	59	32–160	17.3 µg/m³	11.7	24h	26
2026-07-10	55	33–85	14.7 µg/m³	16.7	24h	27
2026-07-09	53	31–71	13.7 µg/m³	20.6	24h	27
2026-07-08	44	16–55	10.7 µg/m³	16.4	20h	26

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