Abstract
Background
The absence of air pollution monitoring networks makes it difficult to assess historical fine particulate matter (PM2.5) exposures for countries in the areas, such as Kuwait, which are severe impacted by desert dust and anthropogenic pollution.
Objective
We constructed an ensemble machine learning model to predict daily PM2.5 concentrations for regions lack of PM2.5 observations.
Methods
The model was constructed based on daily PM2.5, visibility, and other meteorological data collected at two sites in Kuwait. Then, our model was applied to predict the daily level of PM2.5 concentrations for eight airports located in Kuwait and Iraq from 2013 to 2020.
Results
As compared to traditional statistic models, the proposed machine learning methods improved the accuracy in using visibility to predict daily PM2.5 concentrations with a cross-validation R2 of 0.68. The predicted level of daily PM2.5 concentrations were consistent with previous measurements. The predicted average yearly PM2.5 concentration for the eight stations is 50.65 µg/m3. For all stations, the monthly average PM2.5 concentrations reached their maximum in July and their minimum in November.
Significance
These findings make it possible to retrospectively estimate daily PM2.5 exposures using the large-scale databases of historical visibility in regions with few particulate matter monitoring stations.
Impact statement
The scarcity of air pollution ground monitoring networks makes it difficult to assess historical fine particulate matter exposures for countries in arid areas such as Kuwait. Visibility is closely related to atmospheric particulate matter concentrations and historical airport visibility records are commonly available in most countries. Our model make it possible to retrospectively estimate daily PM2.5 exposures using the large-scale databases of historical visibility in arid regions with few particulate matter ground monitoring stations. The product of such models can be critical for environmental risk assessments and population health studies.
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Data availability
All data included in this study are available upon request by contact with the corresponding author.
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Acknowledgements
This work was supported by the VA Cooperative Studies Program #595: Pulmonary Health and Deployment to Southwest Asia and Afghanistan, from the United States (U.S.) Department of Veterans Affairs, Office of Research and Development, Clinical Science Research and Development, Cooperative Studies Program. This publication was also made possible by U.S. Environmental Protection Agency (EPA) grant RD-835872 and NASA grant 80NSSC19K0225. The contents do not represent the views of the U.S. Department of Veterans Affairs, U.S. EPA, or the U.S. Government.
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PK and EG designed the research and directed its implementation; CK, JW, and AA prepared the data; JL analyzed the data and prepared the manuscript; all authors contributed to data interpretation and revisions of the manuscript.
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Li, J., Kang, CM., Wolfson, J.M. et al. Estimation of fine particulate matter in an arid area from visibility based on machine learning. J Expo Sci Environ Epidemiol 32, 926–931 (2022). https://doi.org/10.1038/s41370-022-00480-3
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DOI: https://doi.org/10.1038/s41370-022-00480-3
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