For the first time, mobile campaign and building monitoring experiments were conducted in downtown Seoul, Korea during the 2018/2019 winter period to assess the possibility of the co-benefit of CO₂ emission reduction and air quality improvement. Given that CO₂ and air pollutants in cities both originate from fossil fuel combustion, monitoring urban CO₂ concentrations using a mobile vehicle and from the top of tall buildings can be a potentially effective approach for diagnosing the air quality. The local enhancement values (△species) related to urban emission sources were estimated by eliminating baseline concentrations. The results obtained showed high correlation coefficients between △CO₂ and △air pollutants (i.e., 0.753, 0.505, and 0.525 for △CO, △NO_X, and △NO₂), confirming the applicability of CO₂ as an indicator of air pollutant sources in downtown Seoul. The evaluation of the air quality in the study area using air pollutant ratios, including the ratios of CO and NO_X/NO₂, relative to CO₂ showed that the ratios of △CO, △NO_X, and △NO₂ relative to △CO₂ were 5.76, 1.89, and 0.21 ppb ppm⁻¹. The estimated △NO₂/△NO_X ratio (11%) and a comparison of the △NO_X/△CO₂ ratios obtained with those reported for other cities in different countries suggested the possibility of a relationship between the current air quality in downtown Seoul and the use of diesel vehicles. Results suggest that the development of municipal policies aimed at mitigating climate change should consider the co-benefit of air quality improvement so as to ensure the effective reduction of CO₂ and air pollutant emissions.

在2018/2019冬季期间，首次在韩国首尔市中心进行了移动活动和建筑监控实验，以评估减少CO ₂排放和改善空气质量的共同效益。鉴于城市中的CO ₂和空气污染物均源自化石燃料燃烧，因此使用移动车辆和高层建筑顶部监测城市CO ₂浓度可能是诊断空气质量的潜在有效方法。通过消除基线浓度估算与城市排放源有关的局部增强值（△物种）。所得结果表明△CO ₂之间的相关系数较高。和△空气污染物（即△CO，△NO _X和△NO _2的0.753、0.505和0.525 ），证实了CO ₂作为首尔市中心空气污染物来源指标的适用性。使用空气污染物比率（包括CO和NO _X / NO ₂相对于CO ₂的比率）对研究区域的空气质量进行评估，结果表明△CO，△NO _X和△NO ₂相对于△的比率CO ₂为5.76、1.89和0.21ppb ppm ^-1。估计的△NO ₂ /△NO _X比（11％）和△NO _X /△CO _2的比较与不同国家其他城市的报告得出的比率表明，首尔市中心当前的空气质量与柴油车辆的使用之间可能存在联系。结果表明，旨在缓解气候变化的市政政策的制定应考虑改善空气质量的共同益处，以确保有效减少CO ₂和空气污染物的排放。