What is the air quality trend in Saint Helier?

Over the past 18 days, Saint Helier had an average AQI of 15 based on station measurements. The worst day was with AQI .

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, JE

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, JE.

Current AQI
Good

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

342h · 1 station

Daily Summary

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-04-12	11	6–17	2.6 µg/m³	14h	36
2026-04-11	12	7–23	2.9 µg/m³	24h	39
2026-04-10	13	10–21	3.2 µg/m³	24h	39
2026-04-09	24	9–71	6.1 µg/m³	17h	37
2026-04-08	30	17–40	7.1 µg/m³	9h	35
2026-04-07	15	11–24	3.6 µg/m³	24h	39
2026-04-06	10	7–12	2.3 µg/m³	18h	39
2026-04-04	21	9–32	5.1 µg/m³	14h	38
2026-04-03	24	7–42	5.8 µg/m³	24h	38
2026-04-02	11	8–18	2.7 µg/m³	21h	38
2026-04-01	15	8–32	3.6 µg/m³	21h	38
2026-03-31	26	20–34	6.1 µg/m³	21h	38
2026-03-30	19	10–22	4.6 µg/m³	10h	38
2026-03-29	10	7–17	2.3 µg/m³	23h	38
2026-03-28	10	6–17	2.4 µg/m³	23h	37
2026-03-27	12	9–28	2.9 µg/m³	24h	39
2026-03-26	14	7–32	3.3 µg/m³	24h	39
2026-03-25	9	7–12	2.1 µg/m³	7h	39

Back to Saint Helier Air Quality