Mobile measurements were conducted in Shanghai in autumn 2020 to explore the chemical composition and optical properties of PM. The measurement period was categorized into clean days (PM ≤ 35 μg m) and non-clean days (PM > 35 μg m) to comprehensively understand the impact of local emissions from urban and industrial areas. The average concentration of PM during the mobile measurements period was 28.5 μg m, with organic matter, nitrate, sulfate, and ammonium accounting for an average of 40.67% (11.5 μg m), 20.5% (5.8 μg m), 13.4% (3.8 μg m), and 13.4% (3.8 μg m), respectively. The average extinction coefficients were 85.5 and 112.1 Mm in urban and industrial areas on clean days and 309.1 and 472.9 Mm in urban and industrial areas on non-clean days, respectively. Different interagency monitoring of protected visual environments (IMPROVE) algorithms were used to reconstruct the extinction coefficients using the measured datasets. The existing IMPROVE algorithms were adaptable exclusively on non-clean days. Finally, a novel equation was constructed and verified to determine extinction coefficients using mobile measurements.

中文翻译：

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上海移动测量气溶胶消光系数和化学成分闭合方法开发

2020 年秋季在上海进行了移动测量，以探索 PM 的化学成分和光学特性。测量时段分为清洁天数（PM≤35μgm）和非清洁天数（PM>35μgm），全面了解城市和工业区当地排放的影响。移动测量期间PM平均浓度为28.5 μg m，其中有机物、硝酸盐、硫酸盐、铵态氮平均含量分别为40.67%（11.5 μg m）、20.5%（5.8 μg m）、13.4%（3.8 μg m）。 µg m）和 13.4%（3.8 µg m）。清洁日城市和工业区平均消光系数分别为85.5和112.1 Mm，非清洁日城市和工业区平均消光系数分别为309.1和472.9 Mm。使用不同的机构间受保护视觉环境监测（IMPROVE）算法，使用测量的数据集重建消光系数。现有的 IMPROVE 算法仅适用于非清洁日。最后，构建并验证了一个新颖的方程，以使用移动测量来确定消光系数。