Most polluted cities in Jersey
1 measured city, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Saint Helier at 1.2 µg/m³, #1,284 in the world.
- 1Saint Helierlow-cost sensorsSt Helier 1.20.1×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
Updated 2026-10-01 21:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.