Daily visibility and mortality: assessment of health benefits from improved visibility in Hong Kong.

Environmental Research
Thuan-Quoc ThachAnthony J Hedley

Abstract

Visibility in Hong Kong has deteriorated significantly over 40 years with visibility below 8km in the absence of fog, mist, or precipitation, increasing from 6.6 days in 1968 to 54.1 days in 2007. We assessed the short-term mortality effects of daily loss of visibility. During 1996-2006, we obtained mortality data for non-accidental and cardiorespiratory causes, visibility recorded as visual range in kilometers, temperature, and relative humidity from an urban observatory, and concentrations of four criteria pollutants. A generalized additive Poisson regression model with penalized cubic regression splines was fitted to control for time variant covariates. For non-accidental mortality, an interquartile range (IQR) of 6.5km decrease in visibility at lag0-1 days was associated with an excess risk (ER%) [95% CI] of 1.13 [0.49, 1.76] for all ages and 1.37 [0.65, 2.09] for ages 65 years and over; for cardiovascular mortality of 1.31 [0.13, 2.49] for all ages, and 1.72 [0.44, 3.00] for ages 65 years and over; and for respiratory mortality of 1.92 [0.49, 3.35] for all ages and 1.76 [0.28, 3.25] for ages 65 years and over. The estimated ER% for daily mortality derived from both visibility and air pollutant data were comparable in terms...Continue Reading

Citations

Nov 30, 2013·International Journal of Environmental Research and Public Health·Yoon Ling CheongTobia Lakes
Dec 7, 2014·International Journal of Epidemiology·C M SchoolingG M Leung
Oct 5, 2016·Journal of the Air & Waste Management Association·Shahir MasriPetros Koutrakis
Apr 10, 2014·International Journal of Environmental Research and Public Health·Pui Hing ChauJean Woo
Oct 25, 2013·Journal of the Air & Waste Management Association·Muhammad I ShahzadPak W Chan
Nov 22, 2017·International Journal of Environmental Research and Public Health·Shaohua GuQiyong Liu

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Methods Mentioned

BETA
light scattering

Software Mentioned

mgcv
R

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