SmogRank / Countries / Jersey / 2025
Most polluted cities in Jersey, 2025
1 city in Jersey ranked by their average PM2.5 over the 365 days; 1 above the WHO annual guideline (5.0 µg/m³). Worst: Saint Helier at 8.1 µg/m³, #1,378 of 2,131 cities in the world. A city needs measurements on 70% of the days to be ranked.
- 1Saint Helierlow-cost sensorsSt Helier 8.11.6×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+