Datos de calidad del aire proporcionados por: the China National Urban air quality real-time publishing platform (全国城市空气质量实时发布平台) (113.108.142.147:20035) and the Hunan Environmental Protection Agency (湖南省环境保护厅) (hbt.hunan.gov.cn) and the Weather Underground (wunderground.com) and the Anhui Environmental Protection Agency (安徽省生态环境厅) (sthjt.ah.gov.cn) and the Anhui Environmental Protection Agency (安徽省生态环境厅) (sthjt.ah.gov.cn)