A standardized scale that rates air pollution levels from "Good" to "Hazardous", based on concentrations of pollutants like PM2.5, PM10, ozone and NO2.
measurementWhat is Air Quality Index (AQI)?
Multiple AQI standards exist globally. The US EPA AQI (0–500) and European AQI (0–100+) are the most widely used. Mausam Online uses the European AQI from Open-Meteo, which rates air quality as Good (0–20), Fair (20–40), Moderate (40–60), Poor (60–80), Very Poor (80–100) or Extremely Poor (100+). The most critical pollutant for health is PM2.5 — fine particles that penetrate deep into the lungs.
Key points
- A standardized scale that rates air pollution levels from “Good” to “Hazardous”, based on concentrations of pollutants like PM2.5, PM10, ozone and NO2.
- Category: measurement
Related terms
See also: air-quality-index is connected to other weather concepts. Browse the full glossary for related definitions.