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The San Joaquin Valley (SJV) experiences some of the worst ozone air qualityin the US, frequently exceeding the California 8 h standard of 70.4 ppb.To improve our understanding of trends in the number of ozone violations inthe SJV, we analyze observed relationships between organic reactivity,nitrogen oxides (NOx), and daily maximum temperature in the southernSJV using measurements made as part of California at the Nexus of AirQuality and Climate Change in 2010 (CalNex-SJV). We find the daytimespeciated organic reactivity with respect to OH during CalNex-SJV has atemperature-independent portion with molecules typically associated withmotor vehicles being the major component. At high temperatures,characteristic of days with high ozone, the largest portion of the totalorganic reactivity increases exponentially with temperature and is dominatedby small, oxygenated organics and molecules that are unidentified. We usethis simple temperature classification to consider changes in organicemissions over the last and next decade. With the CalNex-SJV observations asconstraints, we examine the sensitivity of ozone production (PO3) tofuture NOx and organic reactivity controls. We find that PO3 isNOx-limited at all temperatures on weekends and on weekdays when dailymaximum temperatures are greater than 29 °C. As a consequence, NOxreductions are the most effective control option for reducing the frequencyof future ozone violations in the southern SJV

atmospheric chemistry and physics

On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California