What is the air quality trend in Letchworth Garden City?

Over the past 15 days, Letchworth Garden City had an average AQI of 35 based on station measurements. The worst day was 2026-08-03 with AQI 50.

How is Letchworth Garden City air quality measured?

Air quality in Letchworth 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 Letchworth Garden City, United Kingdom

Name: Letchworth 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 Letchworth Garden City, United Kingdom.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 8 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-08	26	26–26	6.2 µg/m³	1.1	1h	8
2026-08-07	37	20–54	8.8 µg/m³	1.2	24h	7
2026-08-06	36	21–96	9.2 µg/m³	1.6	24h	8
2026-08-05	39	21–142	10.2 µg/m³	1.3	24h	8
2026-08-04	43	18–151	11.2 µg/m³	5.5	24h	8
2026-08-03	50	20–218	18.2 µg/m³	3.5	24h	8
2026-08-02	35	15–57	8.4 µg/m³	2.6	24h	7
2026-08-01	29	13–46	7.0 µg/m³	1.2	24h	7
2026-07-31	41	15–135	11.1 µg/m³	2.2	24h	7
2026-07-30	32	16–70	8.0 µg/m³	1.7	24h	7
2026-07-29	37	14–57	9.0 µg/m³	3.2	24h	8
2026-07-28	33	13–181	10.9 µg/m³	2.7	24h	8
2026-07-27	31	19–60	7.6 µg/m³	1.4	24h	6
2026-07-26	34	13–92	8.8 µg/m³	1.9	24h	7
2026-07-25	35	23–54	8.4 µg/m³	4.4	20h	8

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