What is the air quality trend in Saint Helier?

Over the past 8 days, Saint Helier had an average AQI of 31 based on station measurements. The worst day was 2026-07-18 with AQI 58.

How is Saint Helier air quality measured?

Air quality in Saint Helier 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 Saint Helier, Jersey

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

Historical PM2.5 and AQI trend from monitoring stations near Saint Helier, Jersey.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

159h

PM2.5 Station

159h · 35 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	23	21–24	5.4 µg/m³	5h	35
2026-07-21	16	12–20	3.9 µg/m³	23h	35
2026-07-20	13	10–19	3.2 µg/m³	22h	35
2026-07-19	17	11–39	4.0 µg/m³	23h	35
2026-07-18	58	36–64	15.6 µg/m³	23h	35
2026-07-17	39	34–46	9.4 µg/m³	24h	35
2026-07-16	45	37–55	10.9 µg/m³	22h	35
2026-07-15	44	33–53	10.6 µg/m³	17h	35

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