Relationship between the Formation of PM_2.5 and Meteorological Factors in Northern China: The Periodic Characteristics of Wavelet Analysis

Figure 9

Time series of meteorological parameters and pollutants from January 1 to 10, 2016. (a) WD: wind direction; : wind speed (m/s); (b) Temp: temperature (°C); RH: relative humidity (%).

(a)

(b)

(c)