Yiting Wang, Yong Zhang, Xia Li, Junji Cao This email address is being protected from spambots. You need JavaScript enabled to view it.

Key Laboratory of Aerosol Chemistry & Physics (KLACP), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China


Received: April 14, 2020
Revised: September 26, 2020
Accepted: September 26, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2020.04.0146  


Cite this article:

Wang, Y., Zhang, Y., Li, X. anf Cao, J. (2020). Refined Source Apportionment of Atmospheric PM2.5 in a Typical City in Northwest China. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.04.0146


HIGHLIGHTS

  • The sources for PM2.5 were evaluated by using the CAS-HERM receptor model for XXND.
  • Estimate the contributions of local and regional emissions via WRF-CHEM model.
  • A refined source apportionment was done for PM2.5 for XXND.
 

ABSTRACT 


The Xixian New District (XXND), established in 2014, is the seventh national-level new district in China, but research on air pollution there has been limited. This study focused on the characteristics and sources of PM2.5 in XXND from 2017 to 2018. The average annual PM2.5 mass was 67 μg m-3; loadings were high in winter and low in summer. Organic carbon (18.2%), nitrate (17.0%), and sulfate (13.1%) were the main chemical components of PM2.5. A refined statistical assessment of sources was conducted using the CAS-HERM receptor model, and it showed that primary sources accounted for ~58.5% of the PM2.5 annual mass, of which dust accounted for 23.3% (road, construction, and soil dust accounted for 11.4%, 8.0% and 3.9%, respectively) while motor vehicles contributed 10.1% (diesels 8.7% and gasoline vehicles 1.4%). Secondary sources for sulfates, nitrates, and organic aerosols accounted for ~41.5% of the PM2.5 mass. A complementary analysis using the WRF-CHEM model showed that regional transport accounted for 60.8% of the PM2.5 during the winter high-pollution period, which also implies the importance of secondary aerosols.


Keywords: Xixian new district; PM2.5; CAS-HERM; WRF-CHEM.




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