[\'School of Geography, Nantong University, Nantong, China.\', \'Jiangsu Yangtze River Economic Belt Research Institute, Nantong, China.\', \'School of Geographic and Oceanographic Science, Nanjing University, Nanjing, China.\']
Observations on the particle pollution of the cities in China in the Coronavirus 2019 closure: Characteristics and lessons for environmental management.