What is the air quality trend in Letchworth Garden City?

Over the past 15 days, Letchworth Garden City had an average AQI of 57 based on station measurements. The worst day was 2026-05-21 with AQI 79.

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

335h

PM2.5 Station

335h · 6 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	39	19–60	9.4 µg/m³	4.9	20h	8
2026-05-28	46	20–68	11.6 µg/m³	6.4	24h	8
2026-05-27	61	35–167	18.6 µg/m³	12.8	24h	9
2026-05-26	63	34–132	18.6 µg/m³	9.6	24h	9
2026-05-25	76	39–169	25.4 µg/m³	16.8	24h	11
2026-05-24	48	25–71	12.5 µg/m³	8.2	24h	8
2026-05-23	52	24–80	14.1 µg/m³	5.7	24h	9
2026-05-22	53	20–101	14.6 µg/m³	4.6	24h	11
2026-05-21	79	20–189	31.8 µg/m³	4.4	24h	9
2026-05-20	56	16–93	16.1 µg/m³	1.6	24h	8
2026-05-19	73	23–156	23.3 µg/m³	2.6	24h	12
2026-05-18	58	10–158	18.0 µg/m³	1.3	24h	10
2026-05-17	73	18–179	26.9 µg/m³	2.7	24h	12
2026-05-16	53	12–148	15.0 µg/m³	4.4	24h	12
2026-05-15	38	23–45	9.0 µg/m³	1.3	3h	9

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