Package 'openair'

144 windRoseValueNoteset of wind speed and wind directions are to be compared (ws2 and wd2). The second set of valuesis subtracted from the first and the differences compared. If for example, wd2 was biased positivecompared with wd then pollutionRose will show the bias in polar coordinates. In its default use,wind direction bias is colour-coded to show negative bias in one colour and positive bias in another.As well as generating the plot itself, windRose and pollutionRose also return an object of class“openair”. The object includes three main components: call, the command used to generate theplot; data, the data frame of summarised information used to make the plot; and plot, the plotitself. If retained, e.g. using output