The effects of dust–haze on mortality are modified by seasons and individual characteristics in Guangzhou, China

Liu, Tao; Zhang, Yong Hui; Xu, Yongjian; Lin, Hua; Xu, Xiong; Luo, Yuan; Xiao, Jianpeng; Zeng, Weiying; Zhang, Wan Fang; Chu, Cordia; Keogh, Kandice Brooke; Rutherford, Shannon; Qian, Zhengmin; Du, Yao; Hu, Mengjue; Wen, Jun

doi:10.1016/j.envpol.2013.12.027

Cited by 64 publications

(42 citation statements)

References 58 publications

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“…It has a sub-tropic climate controlled by the East Asian Monsoon, more specifically the South China Sea Monsoon. It has warm and wet summers and dry winters, with a mean annual air temperature of 22 • C and annual precipitation of 1700 mm [33]. Over 80% of the annual precipitation falls during the rainy season from April to September [12,34].…”

Section: Study Areamentioning

confidence: 99%

Improvement to the Huff Curve for Design Storms and Urban Flooding Simulations in Guangzhou, China

Pan

Wang

Liu

et al. 2017

Water

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Abstract:The storm hyetograph is critical in drainage design since it determines the peak flooding volume in a catchment and the corresponding drainage capacity demand for a return period. This study firstly compares the common design storms such as the Chicago, Huff, and Triangular curves employed to represent the storm hyetographs in the metropolitan area of Guangzhou using minute-interval rainfall data during 2008-2012. These common design storms cannot satisfactorily represent the storm hyetographs in sub-tropic areas of Guangzhou. The normalized time of peak rainfall is at 33 ± 5% for all storms in the Tianhe and Panyu districts, and most storms (84%) are in the 1st and 2nd quartiles. The Huff curves are further improved by separately describing the rising and falling limbs instead of classifying all storms into four quartiles. The optimal time intervals are 1-5 min for deriving a practical urban design storm, especially for short-duration and intense storms in Guangzhou. Compared to the 71 observed storm hyetographs, the Improved Huff curves have smaller RMSE and higher NSE values (6.43, 0.66) than those of the original Huff (6.62, 0.63), Triangular (7.38, 0.55), and Chicago (7.57, 0.54) curves. The mean relative difference of peak flooding volume simulated with SWMM using the Improved Huff curve as the input is only 2%, −6%, and 8% of those simulated by observed rainfall at the three catchments, respectively. In contrast, those simulated by the original Huff (−12%, −43%, −16%), Triangular (−22%, −62%, −38%), and Chicago curves (−17%, −19%, −21%) are much smaller and greatly underestimate the peak flooding volume. The Improved Huff curve has great potential in storm water management such as flooding risk mapping and drainage facility design, after further validation.

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Section: Study Areamentioning

confidence: 99%

Improvement to the Huff Curve for Design Storms and Urban Flooding Simulations in Guangzhou, China

Pan

Wang

Liu

et al. 2017

Water

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“…We applied the penalized spline function of time and 7 degrees of freedom per year was used to control for secular trend and seasonality. Degrees of freedom for temperature and relative humidity were set to 3 according to the previous studies [15, 16]. Considering the lagging effects of temperature, the 14-day moving average of temperature was used.…”

Section: Methodsmentioning

confidence: 99%

The short term burden of ambient fine particulate matter on chronic obstructive pulmonary disease in Ningbo, China

Huang

et al. 2017

Environ Health

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BackgroundNumerous studies have found associations between ambient fine particulate matter (PM2.5) and increased mortality risk. However, little evidence is available on associations between PM2.5 and years of life lost (YLL). We aimed to estimate the YLL due to chronic obstructive pulmonary disease (COPD) mortality related to ambient PM2.5 exposure.MethodsA time-series study was conducted based on the data on air pollutants, meteorological conditions and 18,472 registered COPD deaths in Ningbo, China, 2011–2015. The effects of PM2.5 on YLL and daily death of COPD were estimated, after controlling long term trend, meteorological index and other confounders.ResultsThe impact of PM2.5 on YLL due to COPD lasted for 5 days (lag 0–4). Per 10 μg/m3 increase in PM2.5 was associated with 0.91 (95%CI: 0.16, 1.66) years increase in YLL. The excess YLL of COPD mortality were 8206 years, and 0.38 day per person in Ningbo from 2011 to 2015. The exposure-response curve of PM2.5 and YLL due to COPD showed a non-linear pattern, with relatively steep at low levels and flattened out at higher exposures.. Furthermore, the effects were significantly higher in the elderly than those in the younger.ConclusionsOur findings explored burden of PM2.5 on YLL due to COPD and highlight the importance and urgency of ambient PM2.5 pollution control and protection of the vulnerable populations.Electronic supplementary materialThe online version of this article (doi:10.1186/s12940-017-0253-1) contains supplementary material, which is available to authorized users.

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“…The data on air pollution and meteorology follow the quality control programs mandated by the Chinese government. These types of data have been widely used to explore their effects on morbidity and mortality in Guangzhou [22][23][24].…”

Section: Data Sourcesmentioning

confidence: 99%

Association of short-term exposure to sulfur dioxide and hospitalization for ischemic and hemorrhagic stroke in Guangzhou, China

Shen

Yuan

et al. 2020

BMC Public Health

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Background: In developing countries, ambient sulfur dioxide (SO 2 ) is a serious air pollutant concern, but there is no enough and consistent epidemiological evidence about its health effects on stroke hospitalization. Methods: We collected the daily air pollution data, meteorological data and number of daily hospital admissions for ischemic and hemorrhagic stroke, in Guangzhou from January 1st 2009 to December 31st 2014. Then we applied generalized additive model with a quasi-Poisson link to assess the relationship between short-term SO 2 exposure and the total number of hospital admissions for ischemic and hemorrhagic stroke. In addition, we evaluated the effect of ambient SO 2 by age (< 65 years and ≥ 65 years). Results: During the study period, a 24-h mean concentration of ambient SO 2 of 27.82 μg/m 3 , a total of 58,473 ischemic stroke and 9167 hemorrhagic stroke hospital admissions hospital were recorded. Ambient SO 2 was found to increase the risk for both ischemic and hemorrhagic stroke hospital admission in single pollutant model. The maximum value of percentage changes for ischemic and hemorrhagic stroke occurred in lag 0 day and lag 1 day, per 10 μg/m 3 increase in SO 2 concentrations was corresponded to a 1.27% (95% confidence interval (CI), 0.42-2.12%) and 1.55% (95%CI, 0.02-3.11%) increased risk, respectively. The association between SO 2 and ischemic stroke hospitalization was robust to two pollutant model, but for hemorrhagic stroke it's partially weakened after adjusting for co-pollutants. The effect of ambient SO 2 on ischemic stroke appeared to be greater for people < 65 years old, but null effect on hemorrhagic stroke was identified for both age groups. Conclusions: We found short-term exposure to ambient SO 2 may significantly increase the risks of hospitalization for ischemic stroke. The findings may contribute to a better understanding of the health effects of low-levels of SO 2 .

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The effects of dust–haze on mortality are modified by seasons and individual characteristics in Guangzhou, China

Cited by 64 publications

References 58 publications

Improvement to the Huff Curve for Design Storms and Urban Flooding Simulations in Guangzhou, China

Improvement to the Huff Curve for Design Storms and Urban Flooding Simulations in Guangzhou, China

The short term burden of ambient fine particulate matter on chronic obstructive pulmonary disease in Ningbo, China

Association of short-term exposure to sulfur dioxide and hospitalization for ischemic and hemorrhagic stroke in Guangzhou, China

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