What is the air quality trend in Colchester?

Over the past 15 days, Colchester had an average AQI of 64 based on station measurements. The worst day was 2026-05-19 with AQI 89.

How is Colchester air quality measured?

Air quality in Colchester 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 Colchester, United Kingdom

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

325h

PM2.5 Station

325h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	53	19–156	15.6 µg/m³	20h	4
2026-05-28	55	29–117	15.1 µg/m³	23h	4
2026-05-27	59	30–121	16.8 µg/m³	23h	4
2026-05-26	72	20–235	26.7 µg/m³	23h	5
2026-05-25	75	36–199	27.2 µg/m³	23h	6
2026-05-24	53	17–182	17.6 µg/m³	23h	4
2026-05-23	55	18–155	16.4 µg/m³	24h	4
2026-05-22	63	23–179	20.7 µg/m³	24h	5
2026-05-21	60	19–171	20.6 µg/m³	24h	3
2026-05-20	81	18–281	34.8 µg/m³	24h	5
2026-05-19	89	16–204	35.4 µg/m³	24h	6
2026-05-18	67	16–187	24.2 µg/m³	24h	5
2026-05-17	76	26–157	24.9 µg/m³	22h	8
2026-05-16	59	5–151	17.8 µg/m³	22h	6
2026-05-15	44	31–56	10.8 µg/m³	2h	4

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