Údaje o kvalitě ovzduší poskytl: the Gangsu Environmental Protection Agency (甘肃省生态环境厅) (sthj.gansu.gov.cn) and 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 Gangsu Environmental Protection Agency (湖南省环境保护厅) (gsep.gansu.gov.cn)