O3 Sensitivity to NOx and VOC During RECAP-CA: Implication for Emissions Control Strategies

Details

• Journal Title:
  ACS ES&T Air
• Personal Author:
  Wu, Shenglun ; Alaimo, Christopher P. ; Zhao, Yusheng ; Green, Peter G. ; Young, Thomas M. ; Liu, Shang ; Kuwayama, Toshihiro ; Coggon, Matthew M. ; Stockwell, Chelsea E. ; Xu, Lu ; Warneke, Carsten ; Gilman, Jessica B. ; Robinson, Michael A. ; Veres, Patrick R. ; Neuman, J. Andrew ; Kleeman, Michael J.
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory)
• 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.
• Source:
  ACS ES&T Air, 1(6), 536-546
• DOI:
  https://doi.org/10.1021/acsestair.4c00026
• ISSN:
  2837-1402 ; 2837-1402
• Format:
  pdf
• Publisher:
  American Chemical Society (ACS)
• Document Type:
  Journal Article
• Funding:
  Grant no. NA17OAR4320101
• License:
  https://creativecommons.org/licenses/by/4.0/
• Rights Information:
  CC BY
• Compliance:
  Library
• Main Document Checksum:
  urn:sha-512:15f981b457110cc1c51f6ee669792bab873aa0c64ecaab2623cab1dfccea28aa36dcc6c473d41471d92348ddf14756194b37d817e7ed34de02aa782cf9a28aa2
• Download URL:
  https://repository.library.noaa.gov/view/noaa/67760/noaa_67760_DS1.pdf
• File Type:
  [PDF - 3.89 MB ]