本标准规定了使用开路差分光吸收光谱（DOAS）技术测定环境空气中二氧化氮（NO2）、二氧化硫（SO2）和臭氧（O3）的方法。本标准规定了这些气体的性能标准，但DOAS测量技术适用于其他气体。这种方法可以提供在100到1000米的开放路径长度上集成的多种气体的测量。

This Standard sets out the method for the determination of nitrogen dioxide (NO2), sulfur dioxide (SO2) and ozone (O3) found in ambient air using the open-path differential optical absorption spectrometry (DOAS) technique. This Standard sets out performance criteria for these gases, however, the DOAS measurement technique is applicable to other gases. This method can provide a measure of multiple gases integrated over an open-path length of between 100 and 1000 metres.