Air Quality Resources
A practical library of authoritative air-quality guidance, datasets, research and methodology references. This resource centre separates measurements, modelled information, AQI communication systems and health guidance so readers can understand what a number actually represents.
Data & Methodology
How AirQualityIndex.org uses monitoring observations, modelled information, AQI calculations and source attribution.
Explore resourceAir Pollution Research
Research themes, evidence sources and pathways for finding peer-reviewed and institutional air-quality evidence.
Explore resourcePrimary Sources
Direct links to WHO, EPA/AirNow, EEA, OpenAQ, Copernicus/CAMS and World Bank resources.
Explore resourceAQI Calculator
Calculate an AQI value using the methodology selected by the user.
Explore resourceAir Quality Explained
Plain-language explanations of AQI, pollutants, measurements, forecasts and health information.
Explore resourceGlobal Real-Time Status
Explore current city-level information available through the site’s real-time data layer.
Explore resourceWhy source transparency matters
Air-quality numbers can come from regulatory monitors, research networks, satellite-informed models, forecasts or derived indices. These sources are not interchangeable. A useful air-quality service should identify the source, time period, units, methodology and whether the value is measured or modelled.
WHO provides health-focused global guidance; EPA/AirNow documents the U.S. AQI; the European Environment Agency publishes the European Air Quality Index; OpenAQ provides access to publicly available monitoring data; and Copernicus CAMS provides atmospheric analyses and forecasts. These resources are linked directly from this site so readers can verify important information at the originating source.