Air Quality Data provided by: the Jiangsu Environmental Protection public network (江苏省城市空气PM2.5等试运行监测数据平台) (hbt.jiangsu.gov.cn) and the Jiangsu Province PM2.5 Air Monitoring Comission (江苏省城市空气PM2.5等试运行监测数据平台) (jshb.gov.cn) and the Weather Underground (wunderground.com)