Effects of Coexposure to Air Pollution from Vegetation Fires and Extreme Heat on Mortality in Upper Northern Thailand
Issued Date
2024-01-01
Resource Type
ISSN
0013936X
eISSN
15205851
Scopus ID
2-s2.0-85194386285
Journal Title
Environmental Science and Technology
Rights Holder(s)
SCOPUS
Bibliographic Citation
Environmental Science and Technology (2024)
Suggested Citation
Uttajug A., Seposo X., Phosri A., Phung V.L.H., Tajudin M.A.B.A., Ueda K. Effects of Coexposure to Air Pollution from Vegetation Fires and Extreme Heat on Mortality in Upper Northern Thailand. Environmental Science and Technology (2024). doi:10.1021/acs.est.3c08074 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/98668
Title
Effects of Coexposure to Air Pollution from Vegetation Fires and Extreme Heat on Mortality in Upper Northern Thailand
Author's Affiliation
Corresponding Author(s)
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Abstract
Background: understanding the effects of coexposure to compound extreme events, such as air pollution and extreme heat, is important for reducing current and future health burdens. This study investigated the independent and synergistic effects of exposure to air pollution from vegetation fires and extreme heat on all-cause mortality in Upper Northern Thailand. Methods: we used a time-stratified case-crossover study design with a conditional quasi-Poisson model to examine the association between mortality and coexposure to air pollution due to vegetation fire events (fire-PM2.5) and extreme heat. Extreme heat days were defined using the 90th and 99th percentile thresholds for daily maximum temperature. Results: we observed a significant positive excess risk of mortality due to independent exposure to fire-PM2.5 and extreme heat, but not an interactive effect. All-cause mortality risk increased by 0.9% (95% confidence interval (CI): 0.1, 1.8) for each 10 μg/m3 increase in fire-PM2.5 on the same day and by 12.8% (95% CI: 10.5, 15.1) on extreme heat days (90th percentile) relative to nonextreme heat days. Conclusion: this study showed that exposure to PM2.5 from vegetation fires and extreme heat independently increased all-cause mortality risk in UNT. However, there was no evidence of a synergistic effect of these events.