Special NSW Bush Fires announcementNews (January 16th): NSW Environment Deparement is now publishing the hourly data for PM2.5 and PM10.
Any new readings starting from Janurary 16th 2020 will be reported using the hourly data.
Note that the NSW Environment agency only reports the PM2.5 level as a 24 hour average, which can make it really difficult to find out what the actual air quality is in real time. However, since visibility is also reported as a 1 hour average, and it is a much better metric for determining the real time quality of the air, the AQI calculation has been updated to take into account the visibility.
Air Quality Data provided by the Office of Environment and Heritage - NSW (environment.nsw.gov.au)