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O3 Sensitivity to NOx and VOC During RECAP-CA: Implication for Emissions Control Strategies
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2024
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Source: ACS ES&T Air, 1(6), 536-546
[PDF-3.89 MB]
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Journal Title:ACS ES&T Air
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Description:Lack of recent progress in reducing ground-level ozone (O3) concentrations to comply with health-based standards in the South Coast Air Basin (SoCAB) has motivated a reanalysis of emission control strategies. Here we used two parallel transportable smog chamber systems to measure the sensitivity of O3 to volatile organic compounds (VOCs) and nitrogen oxides (NOx = NO + NO2) in Pasadena and Redlands, California from July to October, 2021. The transportable smog chamber system measures the ambient O3 sensitivity and the ambient O3 chemical regime by comparing O3 formation in a basecase chamber and a perturbed chamber. The monthly median observed O3 sensitivity in Pasadena was stable in the VOC-limited regime, but showed a seasonal trend in Redlands, where median O3 sensitivity was VOC-limited in July and October and transitioned towards the NOx-limited regime in August and September. Day-specific O3 sensitivity at both Pasadena and Redlands could be either NOx-limited or VOC-limited on O3-nonattainment days. Calculated O3 isopleths for Pasadena and Redlands were constructed using a photochemical box model based on comprehensive measurements of NOx and VOCs during the Re-Evaluating the Chemistry of Air Pollutants in California (RECAP-CA) campaign. Calculated O3 isopleths were in good agreement with the chamber measurements. The calculations suggest that an additional ∼40% NOx reduction is needed for Pasadena and Redlands to move 95% of the days with O3 concentrations above 70 ppb to the NOx-limited regime where further NOx reductions will result in lower O3 concentrations.
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Source:ACS ES&T Air, 1(6), 536-546
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ISSN:2837-1402;2837-1402;
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Rights Information:CC BY
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