Analysis of air pollutants (CO, PM_2.5, NO₂ and O₃), during the dry and rainy seasons of 2015, was conducted in a high-traffic area of Quito, Ecuador. Variations in the annual, diurnal, weekdays, weekends, daytime and nighttime concentration of these pollutants were examined using the data obtained from the public records of the monitoring network in Quito. The highest concentrations of CO, PM_2.5 and NO₂ occurred during the rush hours of the rainy season, while the maximum O₃ concentrations occurred during the midday of the dry season due to the improvement in the O₃-generating photochemical reactions. The “weekend effect” was also observed in this study and was likely primarily due to the accumulation of O₃ in the air. Moreover, the PM_2.5 concentration was higher during the nighttime than during daytime, mainly in the dry season due to the poor horizontal diffusion of PM_2.5 and the absence of precipitation events, while the O₃ concentration was higher during the daytime in both seasons due to the enhancement of the photochemical reactions. A Pearson analysis showed that CO, PM_2.5 and NO₂ were positively intercorrelated. It was identified, through polar plots and a real-time traffic map that the emission sources of these pollutants were in the proximity to the monitoring station, specifically vehicle exhaust emissions. Atmospheric horizontal mixing was an important dilution mechanism of PM_2.5 and NO₂ during the dry season, while transportation of O₃ contributed to its increasing concentration.

在2015年的干燥和雨季期间，在厄瓜多尔基多的高流量地区进行了空气污染物（CO，PM _2.5，NO ₂和O ₃）的分析。使用从基多监测网络的公共记录中获得的数据，检查了这些污染物的年，日，工作日，工作日，周末，白天和晚上的浓度变化。CO，PM _2.5和NO ₂的最高浓度出现在雨季的高峰时段，而O ₃的最大浓度出现在干旱季节的中午，这是由于O ₃的改善-产生光化学反应。在这项研究中也观察到“周末效应”，这可能主要是由于空气中O ₃的积累。此外，夜间的PM _2.5浓度高于白天，主要是在干旱季节，这是由于PM _2.5的水平扩散较差且没有降水事件，而在这两个季节的白天，O ₃浓度均高于白天。增强光化学反应。皮尔逊分析表明，CO，PM _2.5和NO ₂是正相关的。通过极坐标图和实时交通图可以确定这些污染物的排放源在监测站附近，尤其是汽车尾气排放。大气水平混合是干旱季节PM _2.5和NO ₂的重要稀释机理，而O _3的运输促使其浓度增加。