ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ the Environment Monitoring Center of Ningbo (宁波市环境监测中心) (hbj.ningbo.gov.cn) and the Environment Monitoring Center of Ningbo 宁波市环境监测中心) (nbemc.gov.cn) and the Zhejiang Environmental Protection Bureau (浙江省环保厅门户) (sthjt.zj.gov.cn)