PMID- 37562528
OWN - NLM
STAT- MEDLINE
DCOM- 20230918
LR  - 20230918
IS  - 1873-6424 (Electronic)
IS  - 0269-7491 (Linking)
VI  - 335
DP  - 2023 Oct 15
TI  - Impacts of haze and nitrogen oxide alleviation on summertime ozone formation: A 
      modeling study over the Yangtze River Delta, China.
PG  - 122347
LID - S0269-7491(23)01349-0 [pii]
LID - 10.1016/j.envpol.2023.122347 [doi]
AB  - The strict emission control measures have profoundly changed the air pollution in 
      the Yangtze River Delta (YRD) region, China. However, the impacts of decreasing 
      fine particulates (PM(2.5)) and nitrogen oxide (NOx) on summer ozone (O(3)) 
      formation still remain disputable. We perform simulations in the 2018 summer over 
      the YRD using the WRF-Chem model that considers the aerosol radiative forcing 
      (ARF) and HO(2) heterogeneous loss on aerosol surface. The model reasonably 
      reproduces the measured spatiotemporal surface O(3) and PM(2.5) concentrations 
      and aerosol compositions. Model sensitivity experiments show that the NOx 
      mitigation during recent years changes daytime O(3) formation in summer from the 
      transition regime to the NOx-sensitive regime in the YRD. The decreasing NOx 
      emission generally weakens O(3) formation and lowers ambient O(3) levels in 
      summer during recent years, except for some urban centers of megacities. While, 
      the haze alleviation characterized by a decline in ambient PM(2.5) concentration 
      in the past years largely counteracts the daytime O(3) decrease caused by NOx 
      mitigation, largely contributing to the persistently high levels of summertime 
      O(3). The counteracting effect is dominantly attributed to the attenuated ARF and 
      minorly contributed by the suppressed HO(2) uptake and heterogeneous loss on 
      aerosol surface. These results highlight that the repeated O(3) pollution in the 
      YRD is closely associated with NOx and haze alleviation and more efforts must be 
      taken to achieve lower O(3) levels.
CI  - Copyright (c) 2023 Elsevier Ltd. All rights reserved.
FAU - Feng, Tian
AU  - Feng T
AD  - Department of Geography & Spatial Information Techniques, Ningbo University, 
      Ningbo, Zhejiang, 315211, China; Institute of East China Sea, Ningbo University, 
      Ningbo, Zhejiang, 315211, China. Electronic address: fengtian@nbu.edu.cn.
FAU - Liu, Lang
AU  - Liu L
AD  - College of Meteorology and Oceanography, National University of Defense 
      Technology, Changsha, Hunan, 410073, China.
FAU - Zhao, Shuyu
AU  - Zhao S
AD  - Ningbo Meteorological Bureau, Ningbo, Zhejiang, 315012, China.
LA  - eng
PT  - Journal Article
DEP - 20230808
PL  - England
TA  - Environ Pollut
JT  - Environmental pollution (Barking, Essex : 1987)
JID - 8804476
RN  - 66H7ZZK23N (Ozone)
RN  - 0 (Air Pollutants)
RN  - 0 (Nitrogen Oxides)
RN  - 31C4KY9ESH (Nitric Oxide)
RN  - 0 (Dust)
RN  - 0 (Aerosols)
SB  - IM
MH  - *Ozone/analysis
MH  - *Air Pollutants/analysis
MH  - Rivers
MH  - Environmental Monitoring
MH  - *Air Pollution
MH  - Nitrogen Oxides/analysis
MH  - Nitric Oxide
MH  - China
MH  - Dust
MH  - Aerosols/analysis
OTO - NOTNLM
OT  - Aerosol radiative forcing
OT  - Counteracting effect
OT  - Ozone formation
OT  - Yangtze River Delta
COIS- Declaration of competing interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2023/08/11 00:41
MHDA- 2023/09/18 12:43
CRDT- 2023/08/10 19:24
PHST- 2023/06/11 00:00 [received]
PHST- 2023/08/02 00:00 [revised]
PHST- 2023/08/07 00:00 [accepted]
PHST- 2023/09/18 12:43 [medline]
PHST- 2023/08/11 00:41 [pubmed]
PHST- 2023/08/10 19:24 [entrez]
AID - S0269-7491(23)01349-0 [pii]
AID - 10.1016/j.envpol.2023.122347 [doi]
PST - ppublish
SO  - Environ Pollut. 2023 Oct 15;335:122347. doi: 10.1016/j.envpol.2023.122347. Epub 
      2023 Aug 8.