Openair is an open source package developed by King's College London. It is used to perform further analysis on air quality data - it can answer more complicated questions than the simple line plot.
The calendar plot may be used to show the calendar days with the highest concetrations of a pollutant.
Pollution roses are used to show the direction of the pollution agents.
Wind roses show the direction of pollutants for different concentrations (i.e. it is more interesting to know the direction of Nitrous Oxides when the concentration was high than when it was under normal levels)
More information about the Openair package can be found in the manual.