Download and install the free app AirVisual from your app store. It is available for Apple and Android devices, and this article describes its use on iPad. You will be asked for permission for location services to be accessed, and this is useful but not essential. You will be presented with the most recent airquality measure on the left in a number of cities, and forecasts for the next day or two. The colour coding denotes the air quality (green is best), ranging through yellow, to red, purple and brown.
Select one city you wish to investigate and tap (or swipe) to open a more comprehensive page of data. The airquality forecast extends for longer if you swipe the forecast line. As you scroll down the page you will see a table of pollutants showing the current levels for a range of particulates. Tapping each one will tell you what it is, where it comes from and its impacts. <Data history> shows variations in air quality over the previous few hours, and there is a map showing the location of the air-quality monitoring station, and similar stations in the region. Zooming in may reveal more stations than the default scale.
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