Satellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residents
<p><b>Background:</b> A limited number of studies on long-term effects of particulate matter with aerodynamic diameter <2.5 µm (PM<sub>2.5</sub>) on health suggest it can be an important cause of morbidity and mortality. In Asia where air quality is poor and de...
| Main Authors: | , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal article |
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National Institute of Environmental Health Sciences
2015
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| _version_ | 1797106475354554368 |
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| author | Wong, C Lai, H Lee, S Hedley, A Lam, T Tsang, H Thomas, G Lam, K Chan, P Yang, L Lau, A Ayres, J |
| author2 | Thach, T |
| author_facet | Thach, T Wong, C Lai, H Lee, S Hedley, A Lam, T Tsang, H Thomas, G Lam, K Chan, P Yang, L Lau, A Ayres, J |
| author_sort | Wong, C |
| collection | OXFORD |
| description | <p><b>Background:</b> A limited number of studies on long-term effects of particulate matter with aerodynamic diameter <2.5 µm (PM<sub>2.5</sub>) on health suggest it can be an important cause of morbidity and mortality. In Asia where air quality is poor and deteriorating, local data on longterm effects of PM<sub>2.5</sub> to support policy on air quality management are scarce.</p> <p><b>Objectives:</b> We assessed long-term effects of PM2.5 on the mortality in a single Asian city.</p> <p><b>Methods:</b> We followed up for 10–13 years a cohort of 66,820 participants aged ≥65 who were enrolled and interviewed in all 18 Elderly Health Centres of the Department of Health, Hong Kong in 1998–2001. Their residential addresses were geo-coded into x- and y- coordinates and their proxy exposures to PM<sub>2.5</sub> at their addresses in 1×1 km grids were estimated from the US National Aeronautics and Space Administration (NASA) satellite data. We used Cox regression models to calculate hazard ratios (HRs) of mortality associated with PM2.5.</p> <p><b>Results:</b> Mortality HRs per 10-µg/m<sup>3</sup> increase in PM<sub>2.5</sub> were 1.14 (95% CI: 1.07, 1.22) for all natural causes, 1.22 (95% CI: 1.08, 1.39) for cardiovascular causes, 1.42 (95% CI: 1.16, 1.73) for ischemic heart disease, 1.24 (95% CI: 1.00, 1.53) for cerebrovascular disease, and 1.05 (95% CI: 0.90, 1.22) for respiratory causes.</p> <p><b>Conclusions:</b> Our methods in using NASA satellite data provide a readily accessible and affordable approach to estimation of a sufficient range of individual PM<sub>2.5</sub> exposures in a single city. This approach can expand the capacity to conduct environmental accountability studies in areas with few measurements of fine particles.</p> |
| first_indexed | 2024-03-07T07:01:17Z |
| format | Journal article |
| id | oxford-uuid:4b062bef-d19f-4d6c-a334-da9cfeacde06 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T07:01:17Z |
| publishDate | 2015 |
| publisher | National Institute of Environmental Health Sciences |
| record_format | dspace |
| spelling | oxford-uuid:4b062bef-d19f-4d6c-a334-da9cfeacde062022-03-29T17:16:33ZSatellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residentsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:4b062bef-d19f-4d6c-a334-da9cfeacde06ORA DepositNational Institute of Environmental Health Sciences2015Wong, CLai, HLee, SHedley, ALam, TTsang, HThomas, GLam, KChan, PYang, LLau, AAyres, JThach, T<p><b>Background:</b> A limited number of studies on long-term effects of particulate matter with aerodynamic diameter <2.5 µm (PM<sub>2.5</sub>) on health suggest it can be an important cause of morbidity and mortality. In Asia where air quality is poor and deteriorating, local data on longterm effects of PM<sub>2.5</sub> to support policy on air quality management are scarce.</p> <p><b>Objectives:</b> We assessed long-term effects of PM2.5 on the mortality in a single Asian city.</p> <p><b>Methods:</b> We followed up for 10–13 years a cohort of 66,820 participants aged ≥65 who were enrolled and interviewed in all 18 Elderly Health Centres of the Department of Health, Hong Kong in 1998–2001. Their residential addresses were geo-coded into x- and y- coordinates and their proxy exposures to PM<sub>2.5</sub> at their addresses in 1×1 km grids were estimated from the US National Aeronautics and Space Administration (NASA) satellite data. We used Cox regression models to calculate hazard ratios (HRs) of mortality associated with PM2.5.</p> <p><b>Results:</b> Mortality HRs per 10-µg/m<sup>3</sup> increase in PM<sub>2.5</sub> were 1.14 (95% CI: 1.07, 1.22) for all natural causes, 1.22 (95% CI: 1.08, 1.39) for cardiovascular causes, 1.42 (95% CI: 1.16, 1.73) for ischemic heart disease, 1.24 (95% CI: 1.00, 1.53) for cerebrovascular disease, and 1.05 (95% CI: 0.90, 1.22) for respiratory causes.</p> <p><b>Conclusions:</b> Our methods in using NASA satellite data provide a readily accessible and affordable approach to estimation of a sufficient range of individual PM<sub>2.5</sub> exposures in a single city. This approach can expand the capacity to conduct environmental accountability studies in areas with few measurements of fine particles.</p> |
| spellingShingle | Wong, C Lai, H Lee, S Hedley, A Lam, T Tsang, H Thomas, G Lam, K Chan, P Yang, L Lau, A Ayres, J Satellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residents |
| title | Satellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residents |
| title_full | Satellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residents |
| title_fullStr | Satellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residents |
| title_full_unstemmed | Satellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residents |
| title_short | Satellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residents |
| title_sort | satellite based estimates of long term exposure to fine particles and association with mortality in elderly hong kong residents |
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