ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ the Weather Underground (wunderground.com) 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 Ningxia Environmental Protection Agency (宁夏环境保护网) (nxep.gov.cn) and the Ningxia Environmental Protection Agency (宁夏环境保护网) (sthjt.nx.gov.cn)