Dynamic changes in long-term exposure to ambient particulate matter and incidence of hypertension in adults : A natural experiment

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yacong Bo
  • Cui Guo
  • Changqing Lin
  • Ly-Yun Chang
  • Ta-Chien Chan
  • Bo Huang
  • Kam-Pui Lee
  • Tony Tam
  • Alexis K.H. Lau
  • Eng-Kiong Yeoh

Detail(s)

Original languageEnglish
Pages (from-to)669-677
Number of pages9
Journal / PublicationHypertension
Volume74
Issue number3
Online published15 Jul 2019
Publication statusPublished - Sept 2019
Externally publishedYes

Abstract

Many countries dedicated in mitigation of air pollution in the past several decades. However, little is known about how air quality improvement affects health. Therefore, we conducted current study to investigate dynamic changes in long-term exposure to ambient particulate matter (PM2.5) and incidence of hypertension in a large longitudinal cohort. We recruited 134 978 adults aged 18 years or above between 2001 and 2014. All the participants received a series of standard medical examinations, including measurements of blood pressure. The PM2.5 concentration was estimated using a satellite-based spatiotemporal model at a high resolution (1×1 km2). The change in long-term exposure to PM2.5 (ΔPM2.5) was defined as the difference between the values measured during follow-up and during the immediately preceding visit, and a negative value indicated an improvement in PM2.5 air quality. Time-varying Cox model was used to examine the associations between ΔPM2.5 and the development of hypertension. The results show that PM2.5 concentrations increased in 2002, 2003, and 2004, but began to decrease in 2005. Every 5 µg/m3 change in exposure to PM2.5 (ie, a ΔPM2.5 of 5 µg/m3) was associated with a 16% change in the incidence of hypertension (hazard ratio, 0.84; 95% CI, 0.82-0.86). Both stratified and sensitivity analyses generally yielded similar results. We found that an improvement in PM2.5 exposure is associated with a decreased incidence of hypertension. Our findings demonstrate that air pollution mitigation is an effective strategy to reduce the risk of cardiovascular disease.

© 2019 Lippincott Williams and Wilkins. All rights reserved.

Research Area(s)

  • blood pressure, hypertension, particulate matter, quality improvement, risk

Bibliographic Note

Publisher Copyright: © 2019 Lippincott Williams and Wilkins. All rights reserved.

Citation Format(s)

Dynamic changes in long-term exposure to ambient particulate matter and incidence of hypertension in adults: A natural experiment. / Bo, Yacong; Guo, Cui; Lin, Changqing et al.
In: Hypertension, Vol. 74, No. 3, 09.2019, p. 669-677.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review