中文摘要：

主要研究AERONET（Aerosol Robotic Network）提供的的气溶胶光学厚度（Aerosol Optical Thickness，AOT）与空气污染指数（Air Pollution Index，API）之间的相关性。对北京地区2004年全年AERONET提供的气溶胶光学厚度和环保局监测的API进行了相关性分析，发现二者直接对比相关性较低。考虑到AOT的主要影响因素，从以下三个方面进行了探讨：①将数据分成四个季节，构建二者相关性模型；②将经过气溶胶标高垂直订正的AOT数据与API建立相关模型；③考虑到湿度影响因子的作用，按水汽分段分析AOT与API的相关性，发现相关性明显提高。

英文摘要：

The correlation between AOT and API in the urban areas is researched in this paper. By analyzing the correlation of the AOT and API in whole year of 2004 in Beijing City, we find that the correlation coefficient between the AOT and API is small. Considering the main factors which affect the AOT, the data are analyzed in the following three aspects： 1） the data are divided into four seasons to construct the correlation model between AOT and API; 2） adjusted the AOT with the normalized data of aerosol scale heights, then formed the correlation model; 3） the effect of humidity factor is taken into account, the data are separated into several groups with water contents in the air to form each of the correlation model. Results show that the correlation coefficient improves obviously.