What are the three indicators of weather forecast?

This is not a weather forecast indicator, but an air quality indicator!

There are three main types: inhalable particulate matter (PM10); Sulfur dioxide (SO2); Nitrogen dioxide (NO2) (not carbon dioxide mentioned upstairs, carbon dioxide is not a pollutant).

In some places, there are other indicators: for example, nitric oxide, ozone, carbon monoxide and so on.