A Short-Term Measurement of PM2.5 Concentration During the COVID-19 Lockdown Period in Kathmandu Valley

Authors

  • Pawan Kumar Neupane Nepal Academy of Science and Technology, Lalitpur, Nepal
  • Sunil Babu Shrestha Nepal Academy of Science and Technology, Lalitpur, Nepal
  • Dipesh Rupakheti Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • Dev Raj Joshi Central Department of Microbiology, Tribhuvan University, Kathmandu, Nepal
  • Tista Prasai Joshi Nepal Academy of Science and Technology, Lalitpur, Nepal

DOI:

https://doi.org/10.3126/njst.v21i1.49916

Keywords:

Air quality, PM2.5, Kathmandu valley, COVID-19, Lockdown

Abstract

The Government of Nepal implemented a nationwide lockdown from 24 March 2020 to 21 July 2020 to control the person-to-person transmission of COVID-19. This study was conducted in a trafficintensified area of Kathmandu valley, where vehicular movement represents one of the main sources of air pollution. Hence, this study was intended to quantify the concentration of particulate matter (PM2.5) for 11 hours of daytime from 23 April to 20 May 2020. It was also to evaluate the influences of lockdown on air quality. PM2.5 was observed using HAZ-Dust, Environmental Particulate Air Monitor in the 18 different traffic sites of the Kathmandu valley. During the lockdown period, a substantially low mean concentration of PM2.5 ranging from 3.69±1.78 µg/ m3 to 7.58±3.98 µg/m3 was recorded in Kathmandu valley, which reflected improved air quality due to the cessation of vehicular activities. Therefore, the study outcome suggests that controlling the existing vehicular activities and promoting energy-efficient vehicles like electric vehicles in specific locations in the city will improve air quality and benefit public health.

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Published

2022-12-31

How to Cite

Neupane, P. K., Shrestha, S. B., Rupakheti, D., Joshi, D. R., & Joshi, T. P. (2022). A Short-Term Measurement of PM2.5 Concentration During the COVID-19 Lockdown Period in Kathmandu Valley. Nepal Journal of Science and Technology, 21(1), 73–80. https://doi.org/10.3126/njst.v21i1.49916

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