Study on Spatial Temporal Distribution Characteristics of Air Quality Index in Beijing and Its Correlation with Local Meteorological Conditions

Figure 7

Monthly level of air quality in China. (a) AQI of 2014, (b) AQI of 2015, (c) AQI of 2016, (d) AQI of 2017, and (e) AQI of 2014–2017.

(a)

(b)

(c)

(d)

(e)