Home / Standards / GB/T 6921-1986 GB/T 6921-1986 Abolished Determination of the concentration of airborne particulate matters 大气飘尘浓度测定方法 Standard Type GBT ICS 13.040.20 CCS Z50 Status 废止 Issue Date 1986-10-10 Implementation 1987-03-01 Responsible Dept 生态环境部 Drafting Unit N/A