Project at a Glance

Title: Direct Measurements of Ozone Sensitivity to Oxides of Nitrogen and Volatile Organic Compounds in the South Coast Air Basin

Principal Investigator / Author(s): Kleeman, Michael

Contractor: UC Davis

Contract Number: 19RD012

Research Program Area: Atmospheric Processes, Climate Change

Topic Areas: Chemistry & Reactivity

Research Summary:

The combined results from past studies using photochemical grid models and indicator species suggest that oxides of nitrogen (NOx) emissions controls provide an effective method to reduce surface ozone (O3) concentration in California. Direct measurements of the change in O3 per unit change in precursor NOx and volatile organic compound (VOC) concentrations in the atmosphere would build confidence in these predictions. This field project will directly measure O3 sensitivity to precursor NOx and VOC concentrations during the summer months in the South Coast Air Basin (SoCAB) using smog chambers. The measured changes of O3 formation rates will be used to construct probability distribution functions that predict the likely changes in O3 concentrations in response to NOx and VOC perturbations. The results will provide the first statistically significant direct measurements to compare against model predictions for optimal O3 control strategies.

For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

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