Understanding air quality data

Learn about air quality information, find out what air quality index values are and how we calculate them.

We report on air quality in near real-time using up-to-date, accurate concentration data on hourly and daily basis. For most parts of the network, air quality is also presented as an air quality index (AQI) ratingair quality index (AQI) rating. We also report concentration data for these periods. On a daily basis every afternoon, we issue a next-day air quality forecast for Sydney. We share this information in various ways:

  • in tables, maps and text
  • by pollutant, location (site, region) and time
  • on our website, via email/SMS subscription, and in reports.