Abstract: Formaldehyde is the most abundant oxygenated volatile organic compounds in urban atmosphere. In the urban areas formaldehyde comes mainly from primary sources such as vehicular emissions and photochemical oxidation progresses. However, there are very limited researches on sources of ambient formaldehyde. Recently, source apportionment of ambient formaldehyde based on the statistical analysis by using tracers, is of increasing concern. The authors introduce the possible tracers for formaldehyde sources in cities. The results from several case studies indicate the significance of secondary sources to ambient formaldehyde. The feasibility of using various tracers for primary and secondary formaldehyde sources is discussed.

Key words: formaldehyde, photochemical, tracer, glyoxal

摘要： 甲醛是城市大气中浓度水平最高的含氧挥发性有机物。甲醛在城市地区主要来自机动车尾气排放等一次来源及大气光化学反应二次来源。然而，目前识别甲醛一次和二次来源的研究开展得较少。基于大气一次污染和二次污染示踪物的统计分析方法，是大气甲醛来源分析的新进展。作者介绍了采用示踪物估算城市大气甲醛来源贡献的技术方法和初步结果，并针对示踪物的特点讨论了该方法的适用性。

关键词: 甲醛, 光化学, 示踪物, 乙二醛