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 75. According to the US EPA health standard, this air quality rating is categorized as Moderate. The current atmosphere in Jamestown is influenced by a PM2.5 (fine particulate matter) concentration of 22.2 µg/m³ and PM10 levels recorded at 33.9 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
* 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.
Browse Air Quality in Saint Helena, Ascension and Tristan da Cunha by cities in alphabetical order:
Frequently Asked Questions about Air Quality in Saint Helena, Ascension and Tristan da Cunha
What is the air quality in Saint Helena, Ascension and Tristan da Cunha right now?
The current AQI in Jamestown (capital of Saint Helena, Ascension and Tristan da Cunha) is 75 — categorised as Moderate. Conditions vary across the country — see AQI for all cities for a complete picture.
Which city in Saint Helena, Ascension and Tristan da Cunha has the worst air quality right now?
Right now, Jamestown has the highest AQI reading in Saint Helena, Ascension and Tristan da Cunha at 75 (Moderate).
What is the PM2.5 level in Jamestown today?
The PM2.5 (fine particulate) concentration in Jamestown, the capital of Saint Helena, Ascension and Tristan da Cunha, is currently 22.2 µg/m³. The WHO 24-hour guideline is 15 µg/m³.
Air Quality Scales & Resources
Wondering what these AQI numbers mean for your health? Our worldwide air quality guide explains every level of the AQI, PM2.5, PM10, ozone, NO2, CO and SO2 scales, with practical health advice for each range.
→ Understanding Air Quality Levels: read the full guide