This standard is formulated for the purposes of enforcing the Environment Protection Law of the People’s Republic of China and Air Pollution Prevention and Control Law of the People’s Republic of China, protecting the environment, safeguarding the human health, and setting standards for the determination of inorganic hazardous gas in the ambient air by the portable fourier infrared spectrometer method. This standard specifies the portable fourier infrared spectrometer method used to determine 10 inorganic hazardous gases (carbon monoxide, nitrogen dioxide, carbon monoxide, sulfur dioxide, carbon dioxide, hydrogen chloride, hydrogen cyanide, hydrogen floride, nitrogen monoxide, and ammonia) in the ambient air. The appendixes A and B to this standard are normative, and the appendix C is referential. This standard is the original version.

 Ambient air–Emergency monitoring method for inorganic hazardous gas–Portable fourier infrared spectrometer method (HJ 920-2017)