PM_2.5 and O₃ controls are traditionally considered separately because PM_2.5 is usually high in winter while O₃ is generally high in summer. In this study, we explore the opportunity of controlling the two pollutants simultaneously through a better understanding of their intra-seasonal correlation and chemical-coupling behaviors under different meteorological conditions during the late summer and early fall (August–September) episodes in the San Joaquin Valley (SJV), California. A correlation analysis is first used to identify the temporal correlations between O₃ and PM_2.5 and their underlying physical and chemical drivers. Sensitivity analysis is then applied to determine the chemical coupling between PM_2.5 and O₃ and subsequent multipollutant control opportunities under two contrasting meteorological conditions using the Community Multi-Scale Air Quality (CMAQ) model. We find that O₃ and PM_2.5 are positively correlated on the daily timescale because both are sensitive to atmospheric stagnation. However, O₃ and PM_2.5 are negatively correlated on the hourly timescale determined by the negative correlation between hourly NO₃⁻ and O₃, which is mainly due to the opposite effects of T and RH on the diurnal variations of NO₃⁻ and O₃. Reducing NO_x on average lead to O₃ increase, but it can facilitate reducing O₃ at higher O₃ (>75 ppb) locations under the more stagnant conditions. NO_x emission control could become beneficial for both O₃ and PM_2.5 when the NO_x emissions in 2005 are further reduced by 15% under the more stagnant meteorological conditions and by 30% under the more ventilated meteorological conditions.

传统上将PM _2.5和O ₃控件分开考虑，因为冬季PM _2.5通常较高，而夏季O ₃通常较高。在这项研究中，我们探索了通过更好地了解两种污染物在两个季节之间的相互关系以及在圣华金夏末和初秋（八月至九月）期间在不同气象条件下的化学耦合行为来同时控制两种污染物的机会。加利福尼亚的山谷（SJV）。首先使用相关分析来确定O ₃和PM _2.5之间的时间相关性及其潜在的物理和化学驱动因素。然后，使用“社区多尺度空气质量”（CMAQ）模型，通过敏感性分析来确定PM _2.5与O ₃之间的化学耦合以及随后在两种相反的气象条件下的多污染物控制机会。我们发现O ₃和PM _2.5在每日时间尺度上呈正相关，因为它们都对大气停滞敏感。然而，O- ₃和PM _2.5上每小时时间刻度是负相关的确定由间每小时NO负相关₃ ^-和O ₃，这主要是由于T和RH对NO的日变化的作用是相反的₃ ^-和O ₃。减少NO _X平均引线至O ₃增加，但它可以有利于减少ö ₃在较高Ô ₃（> 75 ppb）的越停滞条件下的位置。NO _X排放控制可以成为均为O有益₃和PM _2.5当NO _X在2005年的排放量进一步由15％的更停滞气象条件下和30％的更气象通风条件下还原。