SmogRank / World / Europe / Jersey / St Helier
Most polluted cities in St Helier, Jersey
1 measured city, last 30 days; 0 above the WHO 24-hour guideline. Worst: Saint Helier at 3.2 µg/m³, #2,547 in the world.
- 1Saint Helierlow-cost sensors 18▼307
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
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SmogRank, most polluted cities in St Helier, Jersey, PM2.5, last 30 days to 2 Oct 2026, 19:00 UTC, smogrank.com/je/region/st-helier?w=30d.
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Updated 2026-10-02 19:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.