Air Quality Index (AQI) in Saint Helena, Ascension and Tristan da Cunha 🇸🇭

Live Air Quality Index (AQI) and PM2.5 Levels in Saint Helena, Ascension and Tristan da Cunha

Currently, the Air Quality Index (AQI) in Jamestown, the capital of Saint Helena, Ascension and Tristan da Cunha, is measured at a score of 57. According to the US EPA health standard, this air quality rating is categorized as Good. The current atmosphere in Jamestown is influenced by a PM2.5 (fine particulate matter) concentration of 12.2 µg/m³ and PM10 levels recorded at 20.9 µg/m³. Monitoring of gaseous pollutants shows Nitrogen Dioxide (NO2) at 0.0 µg/m³.

Saint Helena, Ascension and Tristan da Cunha Air Quality: Major Cities Index

Jamestown
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* Air Quality Index (AQI) data for Saint Helena, Ascension and Tristan da Cunha is calculated using the US EPA standard. Information is processed from multiple monitoring stations detecting PM2.5, PM10, and gaseous pollutants to ensure accuracy for respiratory health planning.

Health & Scientific Resources

→ How to read US EPA Air Quality Index before going outside → Understanding Air Quality Index levels and what they mean → When haze forms and what it does to air quality

Air Quality in Saint Helena, Ascension and Tristan da Cunha — FAQ

Common questions about AQI levels, pollutants, and data sources for Saint Helena, Ascension and Tristan da Cunha.

What is the current air quality in Saint Helena, Ascension and Tristan da Cunha?

Live AQI readings for 1 city(ies) across Saint Helena, Ascension and Tristan da Cunha are listed above on the US EPA 0-500 scale.

Where does Saint Helena, Ascension and Tristan da Cunha's AQI data come from?

Real-time readings come from ground-based monitoring stations operated by national environmental agencies in Saint Helena, Ascension and Tristan da Cunha, delivered via WeatherAPI.com and aggregated using the EPA AQI formula.

What is a healthy AQI value in Saint Helena, Ascension and Tristan da Cunha?

On the EPA scale used worldwide, 0-50 is Good, 51-100 is Moderate, 101-150 is Unhealthy for sensitive groups, 151-200 is Unhealthy, 201-300 is Very Unhealthy, and 301-500 is Hazardous. The WHO 24-hour PM2.5 guideline is 15 μg/m³.

Why do AQI readings vary between cities in Saint Helena, Ascension and Tristan da Cunha?

Air quality is highly local — major pollution sources (traffic, industry, dust, wildfires) cluster around cities, while wind direction and topography move them around. Comparing nearby readings on this page is the best way to see how conditions change across Saint Helena, Ascension and Tristan da Cunha.