What is the air quality trend in Saint Helier?

Over the past 15 days, Saint Helier had an average AQI of 17 based on station measurements. The worst day was 2026-05-28 with AQI 45.

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

328h

PM2.5 Station

328h · 36 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	7	6–9	1.7 µg/m³	11h	36
2026-06-08	11	6–19	2.6 µg/m³	24h	36
2026-06-07	13	11–14	3.1 µg/m³	24h	36
2026-06-06	13	8–21	3.2 µg/m³	23h	36
2026-06-05	10	7–12	2.3 µg/m³	24h	36
2026-06-04	14	10–17	3.4 µg/m³	24h	36
2026-06-03	11	7–18	2.7 µg/m³	24h	36
2026-06-02	14	10–23	3.3 µg/m³	24h	36
2026-06-01	18	13–24	4.3 µg/m³	21h	37
2026-05-31	18	11–28	4.3 µg/m³	24h	37
2026-05-30	12	7–24	2.8 µg/m³	24h	37
2026-05-29	28	16–54	6.7 µg/m³	24h	37
2026-05-28	45	28–56	10.9 µg/m³	22h	37
2026-05-27	22	18–31	5.3 µg/m³	24h	37
2026-05-26	20	16–25	4.8 µg/m³	11h	37

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