To investigate the causes of ozone pollution in Kunming city during the spring season, a field atmospheric experiment was conducted at Yijingyuan Hotel, Kunming city, from April 15 to May 20, 2021. The study analyzed the variation patterns of atmospheric photochemical pollutants in Kunming city during the spring season, and a box model was utilized to simulate the local chemical generation of ozone and the sensitivity of its formation.The results showed that during the observation period, the ozone pollution precursors volatile organic compound (VOCs), nitrogen dioxide (NO₂)and carbon monoxide (CO) in Kunming increased significantly, the photochemical reaction activity was strong, and the photochemical generation played a significant role in the initiation and aggravation stages of ozone pollution. The peak values of ozone formation rate F(O₃) were close to 20×10⁻⁹ h⁻¹ and 16×10⁻⁹ h⁻¹, respectively. The results indicate that Kunming is in a VOCs-limited area. In addition to reducing anthropogenic VOCs such as alkenes and aromatics, controlling the CO concentration is also an effective way to control ozone pollution.

为分析昆明市春季臭氧(O₃)污染成因, 于2021年4月15日—5月20日在昆明市怡景园组织大气野外观测实验, 对大气污染物和光化学参数进行测量, 分析昆明市春季大气光化学污染物的变化特征, 并利用盒子模型模拟O₃的局地化学生成和O₃的生成敏感性。结果表明, 观测期间昆明市O₃污染过程中前体物挥发性有机物(VOCs)、二氧化氮(NO₂)和一氧化碳(CO)显著升高, 光化学反应活性强, 在臭氧污染起始和加重阶段光化学生成作用显著, 臭氧生成速率F(O₃)峰值分别接近20×10⁻⁹ h⁻¹和16×10⁻⁹ h⁻¹。研究中还发现, 昆明市处于VOCs控制区, 除减少烯烃和芳香烃等人为源VOCs以外, 控制CO浓度也是控制臭氧污染的有效方式之一。