Figure 3

Hourly variations in observed (solid lines) and simulated (dashed lines) PM10 concentrations at four monitoring sites in Zhengzhou during the study period. (a is the verification of observed and simulated values at 1316A station; b is the verification of observed and simulated values at 1319A station; c is the verification of observed and simulated values at 1320A station; d is the verification of observed and simulated values at 1324A station).