*2.1. Study Area*

Jiangsu Province is located at the Yangtze River in eastern China. The region has a long coastline of 954 km. We also chose 17 environmental monitoring stations close to these 17 weather stations. The distribution of meteorological stations and state-controlled environmental protection stations (SCEPSs) in Jiangsu is shown in Figure 1.

**Figure 1.** Geographical location of Jiangsu Province, the distribution of environmental monitoring stations, and their nearest weather stations in the study area.

#### *2.2. Observations*

The observation period was from 2013 to 2017, including hourly precipitation, wind speed, wind direction, and PM10 and PM2.5 particulate concentrations. The PM10 and PM2.5 particle monitors used were BAM1020 particle monitors (Met One Instruments INC, Grants Pass, OR, USA) produced by the American company METONE (https://metone. com/products/bam-1020/, accessed on 10 June 2021). The BAM-1020, on an hourly basis, automatically measures and records airborne particulate concentration levels (in micrograms per cubic meter) using the industry-proven principle of beta ray attenuation, which can obtain the PM10 and PM2.5 mass concentrations in the environment in real time.
