What is the air quality in St. Helier?

St. Helier, Jersey has an annual US AQI of 45 (Reasonable) and average PM2.5 of 8.5 µg/m³, ranking #459 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in St. Helier?

August is typically the cleanest month (AQI 37) and March the most polluted (AQI 56).

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

Global rank	City	Continent	AQI	PM2.5
459	St. Helier, Jersey	Europe	AQI 45	PM2.5 8.5 µg/m³