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Air Quality Index (AQI) Explanation

The AQI is a scale used to report air quality. Higher values indicate worse air quality and greater health concerns.

Historical Data

This chart shows the trend of the selected pollutant over the past week for the top city.

Color Key

Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous
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Welcome to ClearSky Metrics

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ClearSky Metrics provides real-time air quality data for cities around the world. Our dashboard allows you to track pollutant levels, view trends, and stay informed about environmental health.

Note: For the best experience, we can use your location to show you the most relevant air quality data for your area.

Understanding air quality measurements:

  • PM2.5: Fine inhalable particles with diameters of 2.5 micrometers or smaller.
  • PM10: Inhalable particles with diameters of 10 micrometers or smaller.
  • Ozone (O3): A harmful air pollutant at ground level.
  • Nitrogen Dioxide (NO2): Produced by combustion processes, can irritate airways.
  • Sulfur Dioxide (SO2): Produced from the burning of fossil fuels, can affect the respiratory system.
  • Carbon Monoxide (CO): A colorless, odorless gas that can be harmful when inhaled in large amounts.