What is the air quality trend in Letchworth Garden City?

Over the past 15 days, Letchworth Garden City had an average AQI of 39 based on station measurements. The worst day was 2026-10-20 with AQI 64.

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

330h

PM2.5 Station

330h · 6 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	46	19–136	13.0 µg/m³	5.3	15h	8
2026-10-20	64	32–96	18.7 µg/m³	30.6	24h	7
2026-10-19	36	13–64	8.9 µg/m³	10.1	24h	5
2026-10-18	36	14–151	9.8 µg/m³	1.1	23h	4
2026-10-17	39	3–95	10.4 µg/m³	1.7	23h	6
2026-10-16	37	8–152	10.2 µg/m³	1.7	24h	4
2026-10-15	32	5–97	8.3 µg/m³	2.4	24h	5
2026-10-14	32	15–68	8.0 µg/m³	1.4	24h	5
2026-10-13	32	10–67	8.1 µg/m³	1.7	24h	6
2026-10-12	39	8–145	11.0 µg/m³	3.7	24h	8
2026-10-11	49	8–163	15.0 µg/m³	5.0	23h	5
2026-10-10	41	14–79	11.0 µg/m³	2.1	24h	6
2026-10-09	44	15–131	12.3 µg/m³	2.2	24h	8
2026-10-08	31	11–65	7.6 µg/m³	1.1	24h	7
2026-10-07	28	7–42	6.7 µg/m³	4.9	6h	6

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