Special Issue on Air Pollution and its Impact in South and Southeast Asia (IX)

Nafisa Islam  1, Tarik Reza Toha  2, Mohammad Maksimul Islam3, Tanvir Ahmed This email address is being protected from spambots. You need JavaScript enabled to view it.4 

1 Department of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh
2 Department of Computer Science and Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh
3 Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, NC, USA
4 Department of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh


Received: February 16, 2022
Revised: November 16, 2022
Accepted: December 5, 2022

 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.220082  


Cite this article:

Islam, N., Toha, T.R., Islam, M.Ma., Ahmed, T. (2023). Spatio-temporal Variation of Meteorological Influence on PM2.5 and PM10 over Major Urban Cities of Bangladesh. Aerosol Air Qual. Res. 23, 220082. https://doi.org/10.4209/aaqr.220082


HIGHLIGHTS

  • Meteorological influence on PM variation depends on temporal and regional factors.
  • Cross correlation indicates varied lagged response of PM to meteorological variation.
  • Including meteorological lagged terms in MNLR increases the PM prediction accuracy.
 

ABSTRACT


A detrended seasonal analysis on a 6-year (2013–2018) dataset of daily Particulate Matter (PM) concentration and meteorological parameters is performed to understand the spatio-temporal variation of PM and the seasonal influence of meteorological factors on PM pollution over 6 major urban cities of Bangladesh. Cross-correlation and multiple non-linear regression (MNLR) of air quality and meteorological data were used to explore the meteorology-PM interactions and their spatio-temporal variability. Meteorological influence on PM was found to be stronger in the southern part of the country relative to the northwestern part. MNLR analysis implied that meteorological parameters could explain up to 39% of daily PM variability during high pollution days. The deposition effect of relative humidity was prominent during the premonsoon season, while rainfall impact becomes dominant in the monsoon season, specifically in the northeastern region. Wind speed was observed to have a dilatory effect on PM variation, although wind seemed to carry sea aerosol in southern regions. In addition, the northwestern wind appeared to contribute to PM rise in most urban areas by carrying PM loading. In winter, the low temperature was found to favor PM accumulation, while in monsoon, high temperature causes PM rise, possibly by assisting atmospheric secondary aerosol formation. Solar radiation positively influenced atmospheric PM formation, and the influence was stronger in the northwestern region. It is shown that meteorological parameters influence the seasonal variability of PM, but the extent of this influence varies depending on temporal and regional factors.


Keywords: Particulate matter, Meteorology, Seasonal variation, Cross-correlation, Multiple non-linear regression




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