Home / Standards / GB/T 39499-2020 GB/T 39499-2020 Active Technical guideline for derivation of health protection zone about fugitive emission of atmospheric harmful substances 大气有害物质无组织排放卫生防护距离推导技术导则 Standard Type GBT ICS 13.040 CCS C51 Status 现行 Issue Date 2020-11-19 Implementation 2021-06-01 Responsible Dept 国家疾控局 Drafting Unit N/A