Health and economic costs attributable to ambient air pollution levels in the Kathmandu Valley, Nepal
1
Issued Date
2026-12-01
Resource Type
eISSN
30050774
Scopus ID
2-s2.0-105039571358
Journal Title
Discover Public Health
Volume
23
Issue
1
Rights Holder(s)
SCOPUS
Bibliographic Citation
Discover Public Health Vol.23 No.1 (2026)
Suggested Citation
Adhikari S., Rattanapan C., Laosee O., Thapa S., Acharya S.R., Saud B., Sriram S., Bhatta J. Health and economic costs attributable to ambient air pollution levels in the Kathmandu Valley, Nepal. Discover Public Health Vol.23 No.1 (2026). doi:10.1186/s12982-026-02083-x Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/117003
Title
Health and economic costs attributable to ambient air pollution levels in the Kathmandu Valley, Nepal
Corresponding Author(s)
Other Contributor(s)
Abstract
Background: Ambient fine particulate matter (PM<inf>2.5</inf>) is a major environmental health risk in South Asia, yet evidence quantifying its combined health and economic burden at the city level remains limited in low- and middle-income countries. Kathmandu Valley, Nepal, experiences persistently high PM<inf>2.5</inf> concentrations due to rapid urbanization, traffic emissions, biomass combustion, and adverse topography. Methods: This study applied an environmental burden of disease framework to estimate mortality, disability-adjusted life years (DALYs), and economic costs attributable to long-term ambient PM<inf>2.5</inf> exposure in Kathmandu Valley. Seasonal PM<inf>2.5</inf> concentrations were obtained from seven government-operated monitoring stations in the Kathmandu Valley. Population-attributable fractions were calculated using a log-linear concentration–response function, and health losses were monetized using a value-of-a-statistical-life-year approach. Results: The annual mean PM<inf>2.5</inf> concentration was 99.3 µg/m<sup>3</sup>, nearly 20 times the WHO 2021 air quality guideline, with the highest seasonal levels occurring in winter (135.2 µg/m<sup>3</sup>). Long-term PM<inf>2.5</inf> exposure was associated with approximately 8,900 premature deaths annually (43% population-attributable fraction). The total health burden was estimated at 575,247 DALYs per year, comprising 340,247 years of life lost and 235,000 years lived with disability. The associated annual economic cost was approximately USD 1.25 billion, predominantly affecting the working-age population. Conclusion: Ambient PM<inf>2.5</inf> pollution imposes a severe and persistent health and economic burden on the Kathmandu Valley, with impacts far exceeding international health-protective thresholds throughout the year. These findings underscore the urgency of implementing effective air quality management strategies and provide robust, policy-relevant evidence to support investment in pollution reduction and public health protection in Nepal.