在影响档案制成材料耐久性的诸因素中,空气是永远存在的重要因素之一。档案材料无时无刻不处在空气的包围之中,因此,研究空气的成分、质量以及大气环境污染物对档案制成材料寿命的影响,是档案保护技术工作的一个组成部分。大气的成分及大气的污染大气由干洁空气、水蒸气和尘埃杂质三部分组成。干洁空气由氮气(78%)、氧气(21%)、氩气(0.9%)、二氧化碳(0.03%)及微量惰性气体组成。水蒸汽来源于地面水的蒸发,其含量不稳定,随着时间、地点、气象条件的不同而发生较大的变化,其变化范围在0—4%之间。大气中水蒸汽的存在使大气成 Among the factors that affect the durability of archival materials, air is one of the most important factors. Therefore, studying the composition and quality of air as well as the impact of atmospheric pollutants on the life span of archival materials is an integral part of the archival protection technology. Atmospheric composition and atmospheric pollution The atmosphere consists of dry clean air, water vapor and dust impurities in three parts. Clean air is composed of nitrogen (78%), oxygen (21%), argon (0.9%), carbon dioxide (0.03%) and traces of inert gas. Water vapor from the surface water evaporation, its content is unstable, with time, place, meteorological conditions of the larger changes occur, the range of 0-4%. The presence of water vapor in the atmosphere makes the atmosphere into