Home / Standards / GB/T 13906-1992 GB/T 13906-1992 Abolished Air quality--Determination of nitrogen oxides 空气质量 氮氧化物的测定 Standard Type GBT ICS 13.040.20 CCS Z15 Status 废止 Issue Date 1992-11-23 Implementation 1993-09-01 Responsible Dept 生态环境部 Drafting Unit N/A