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 Tianjin Environmental Monitoring Center (天津市环境监测中心) (tjemc.org.cn)