ISO 9022-20:2014规定了与光学仪器（包括其他领域（如机械、化学和电子设备）在同等条件下的环境试验相关的方法，以确定其在潮湿大气中抵抗二氧化硫（SO2）或硫化氢（H2S）影响的能力。 测试的目的是调查二氧化硫或硫化氢对试样的光学、气候、机械、化学和电气性能特性的影响程度。 ISO 9022-20:2014不适用于使用高浓度二氧化硫测试材料和表面涂层的耐腐蚀性，通常使用代表性样品作为试样。适当的材料标准适用于此类试验。

ISO 9022-20:2014 specifies the methods relating to the environmental tests of optical instruments including additional assemblies from other fields (e.g. mechanical, chemical, and electronic devices), under equivalent conditions, for their ability to resist the influence of sulfur dioxide (SO2) or hydrogen sulfide (H2S) in a humid atmosphere. The purpose of the testing is to investigate to what extent optical, climatic, mechanical, chemical, and electrical performance characteristics of the specimen are affected by sulfur dioxide or hydrogen sulfide. ISO 9022-20:2014 is not applicable to the testing of material and surface coatings for their corrosion resistance using high concentrations of sulfur dioxide, for which representative samples are generally used as specimens. The appropriate material standards apply to tests of this type.