PMID- 35855520
OWN - NLM
STAT- MEDLINE
DCOM- 20220803
LR  - 20220826
IS  - 1520-5851 (Electronic)
IS  - 0013-936X (Linking)
VI  - 56
IP  - 15
DP  - 2022 Aug 2
TI  - Two Decades of Changes in Summertime Ozone Production in California's South Coast 
      Air Basin.
PG  - 10586-10595
LID - 10.1021/acs.est.2c01026 [doi]
AB  - Tropospheric ozone (O(3)) continues to be a threat to human health and 
      agricultural productivity. While O(3) control is challenging, tracking underlying 
      formation mechanisms provides insights for regulatory directions. Here, we 
      describe a comprehensive analysis of the effects of changing emissions on O(3) 
      formation mechanisms with observational evidence. We present a new approach that 
      provides a quantitative metric for the ozone production rate (OPR) and its 
      sensitivity to precursor levels by interpreting two decades of in situ 
      observations of the six criteria air pollutants(2001-2018). Applying to the South 
      Coast Air Basin (SoCAB), California, we show that by 2016-2018, the basin was at 
      the transition region between nitrogen oxide (NO(x))-limited and volatile organic 
      compound (VOC)-limited chemical regimes. Assuming future weather conditions are 
      similar to 2016-2018, we predict that NO(x)-focused reduction is required to 
      reduce the number of summer days the SoCAB is in violation of the National 
      Ambient Air Quality Standard (70 ppbv) for O(3). Roughly,  approximately 40% ( approximately 60%) NO(x) 
      reductions are required to reduce the OPR by  approximately 1.8 ppb/h ( approximately 3.3 ppb/h). This change 
      would reduce the number of violation days from 28 to 20% (10%) in a year, mostly 
      in summertime. Concurrent VOC reductions which reduce the production rate of 
      HO(x) radicals would also be beneficial.
FAU - Perdigones, Begie C
AU  - Perdigones BC
AUID- ORCID: 0000-0002-0333-6277
AD  - School of Earth Sciences and Environmental Engineering, Gwangju Institute of 
      Science and Technology, Gwangju 61005, Korea.
FAU - Lee, Soojin
AU  - Lee S
AD  - School of Earth Sciences and Environmental Engineering, Gwangju Institute of 
      Science and Technology, Gwangju 61005, Korea.
FAU - Cohen, Ronald C
AU  - Cohen RC
AUID- ORCID: 0000-0001-6617-7691
AD  - Department of Chemistry, University of California, Berkeley, California 94720, 
      United States.
AD  - Department of Earth and Planetary Science, University of California, Berkeley, 
      California 94720, United States.
FAU - Park, Jeong-Hoo
AU  - Park JH
AD  - Climate and Air Quality Research Department, National Institute of Environmental 
      Research, Incheon 22689, Korea.
FAU - Min, Kyung-Eun
AU  - Min KE
AD  - School of Earth Sciences and Environmental Engineering, Gwangju Institute of 
      Science and Technology, Gwangju 61005, Korea.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20220719
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Air Pollutants)
RN  - 0 (Volatile Organic Compounds)
RN  - 66H7ZZK23N (Ozone)
SB  - IM
MH  - *Air Pollutants/analysis
MH  - *Air Pollution/analysis
MH  - California
MH  - Environmental Monitoring
MH  - Humans
MH  - *Ozone/analysis
MH  - *Volatile Organic Compounds
OTO - NOTNLM
OT  - air quality
OT  - ozone production rate
OT  - ozone production sensitivity
OT  - prediction
OT  - regulation
OT  - tropospheric ozone
EDAT- 2022/07/21 06:00
MHDA- 2022/08/04 06:00
CRDT- 2022/07/20 02:22
PHST- 2022/07/21 06:00 [pubmed]
PHST- 2022/08/04 06:00 [medline]
PHST- 2022/07/20 02:22 [entrez]
AID - 10.1021/acs.est.2c01026 [doi]
PST - ppublish
SO  - Environ Sci Technol. 2022 Aug 2;56(15):10586-10595. doi: 10.1021/acs.est.2c01026. 
      Epub 2022 Jul 19.