Fig. 2
From: Air quality forecasting based on cloud model granulation
Histogram of AQI classes. It computes the cumulative days of various different air quality classes at different localities in the observation period. The first group of histograms shows the days that belong to the first AQI class at three locations. The second group of histograms shows the days that belong to the second AQI class at three locations. The third group of histograms shows the days that belong to the third AQI class at three locations. The fourth group of histograms shows the days that belong to the fourth AQI class at three locations. The fifth group of histograms shows the days that belong to the fifth AQI class at three locations. The blue column is the result of the GH locality and the green column is the result of the ZKX locality. The yellow column is the result of the JHS locality