The role of absolute humidity in respiratory mortality in Guangzhou, a hot and wet city of South China

Abstract Background For the reason that many studies have been inconclusive on the effect of humidity on respiratory disease, we examined the association between absolute humidity and respiratory disease mortality and quantified the mortality burden due to non-optimal absolute humidity in Guangzhou, China. Methods Daily respiratory disease mortality including total 42,440 deaths from 1 February 2013 to 31 December 2018 and meteorological data of the same period in Guangzhou City were collected. The distributed lag non-linear model was used to determine the optimal absolute humidity of death and discuss their non-linear lagged effects. Attributable fraction and population attributable mortality were calculated based on the optimal absolute humidity, defined as the minimum mortality absolute humidity. Results The association between absolute humidity and total respiratory disease mortality showed an M-shaped non-linear curve. In total, 21.57% (95% CI 14.20 ~ 27.75%) of respiratory disease mortality (9154 deaths) was attributable to non-optimum absolute humidity. The attributable fractions due to high absolute humidity were 13.49% (95% CI 9.56 ~ 16.98%), while mortality burden of low absolute humidity were 8.08% (95% CI 0.89 ~ 13.93%), respectively. Extreme dry and moist absolute humidity accounted for total respiratory disease mortality fraction of 0.87% (95% CI − 0.09 ~ 1.58%) and 0.91% (95% CI 0.25 ~ 1.39%), respectively. There was no significant gender and age difference in the burden of attributable risk due to absolute humidity. Conclusions Our study showed that both high and low absolute humidity are responsible for considerable respiratory disease mortality burden, the component attributed to the high absolute humidity effect is greater. Our results may have important implications for the development of public health measures to reduce respiratory disease mortality.

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Ambient Ozone Pollution and Daily Mortality in Hohhot, China: A Time-Series Study

10.21203/rs.3.rs-782237/v1 ◽

2021 ◽

Author(s):

Chunyan Xia ◽

Ying Liu ◽

Jinli Xie ◽

Huiqiu Zheng ◽

Liwei Niu ◽

...

Keyword(s):

Time Series ◽

Respiratory Disease ◽

Respiratory Diseases ◽

Meteorological Data ◽

Additive Model ◽

Positive Association ◽

Ozone Pollution ◽

Significant Positive Association ◽

Respiratory Mortality ◽

Short Term Exposure

Abstract Evidence on the effects of ozone on chronic lower respiratory disease (CLRD), acute respiratory infections (ARI) is still not conclusive. This study aimed to investigate the association between them in Hohhot China. Daily death counts, concentrations of PM2.5, PM10, SO2, NO2, and O3, and meteorological data were collected for Hohhot city from January 1, 2018, to December 31, 2019. We performed a time series analysis using generalized additive model (GAM). In single pollutant model, the estimated excess relative risks (EERs) for respiratory and CLRD mortality were 2.815% (95% CI: 0.075–5.630) at lag 04 and 4.409% (95% CI: 1.577–7.320) at lag 01, respectively, for each 10 µg/m3 increase in O3. No significant association was found for ARI and the other respiratory diseases mortality. Subgroup analysis showed that the respiratory diseases for men were more susceptible to O3 than women, while men had a lower association with CLRD than women. Concentrations of O3 were significantly associated with respiratory disease and CLRD for older adults. The significant positive association between O3 and respiratory mortality and CLRD mortality remained largely unchanged in the two-pollutant model and the multi-pollutant model. In conclusion, short-term exposure to O3 is significantly associated respiratory diseases and CLRD mortality, and this association is dominated by gender and age.

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Vitamin D Insufficiency and Deficiency and Mortality from Respiratory Diseases in a Cohort of Older Adults: Potential for Limiting the Death Toll during and beyond the COVID-19 Pandemic?

Nutrients ◽

10.3390/nu12082488 ◽

2020 ◽

Vol 12 (8) ◽

pp. 2488 ◽

Cited By ~ 7

Author(s):

Hermann Brenner ◽

Bernd Holleczek ◽

Ben Schöttker

Keyword(s):

Older Adults ◽

Vitamin D ◽

Respiratory Disease ◽

Vitamin D3 ◽

Respiratory Diseases ◽

Vitamin D Insufficiency ◽

Blood Levels ◽

Respiratory Mortality ◽

Disease Mortality ◽

Vitamin D3 Supplementation

The COVID-19 pandemic goes along with increased mortality from acute respiratory disease. It has been suggested that vitamin D3 supplementation might help to reduce respiratory disease mortality. We assessed the prevalence of vitamin D insufficiency and deficiency, defined by 25-hydroxyvitamin D (25(OH)D) blood levels of 30–50 and <30 nmol/L, respectively, and their association with mortality from respiratory diseases during 15 years of follow-up in a cohort of 9548 adults aged 50–75 years from Saarland, Germany. Vitamin D insufficiency and deficiency were common (44% and 15%, respectively). Compared to those with sufficient vitamin D status, participants with vitamin D insufficiency and deficiency had strongly increased respiratory mortality, with adjusted hazard ratios (95% confidence intervals) of 2.1 (1.3–3.2) and 3.0 (1.8–5.2) overall, 4.3 (1.3–14.4) and 8.5 (2.4–30.1) among women, and 1.9 (1.1–3.2) and 2.3 (1.1–4.4) among men. Overall, 41% (95% confidence interval: 20–58%) of respiratory disease mortality was statistically attributable to vitamin D insufficiency or deficiency. Vitamin D insufficiency and deficiency are common and account for a large proportion of respiratory disease mortality in older adults, supporting the hypothesis that vitamin D3 supplementation could be helpful to limit the burden of the COVID-19 pandemic, particularly among women.

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Physiological equivalent temperature (PET) and non-accidental, cardiovascular and respiratory disease mortality in Ahvaz, Iran

Environmental Geochemistry and Health ◽

10.1007/s10653-021-01063-1 ◽

2021 ◽

Author(s):

Maryam Dastoorpoor ◽

Narges Khodadadi ◽

Kambiz Masoumi ◽

Narges Khanjani ◽

Esmaeil Idani ◽

...

Keyword(s):

Respiratory Disease ◽

Equivalent Temperature ◽

Physiological Equivalent Temperature ◽

Disease Mortality

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Relation between Concentration of Pollutants and Some Climatic Parameters on Cardiovascular and Respiratory Disease Mortality in Shiraz

Journal of Shahid Sadoughi University of Medical Sciences ◽

10.18502/ssu.v28i3.3744 ◽

2020 ◽

Author(s):

Kamal Omidvar ◽

Sepideh Shahaeian ◽

Mahbobeh Amiri Esfandegheh

Keyword(s):

Respiratory Diseases ◽

Correlation Coefficients ◽

Mortality Rates ◽

Climatic Parameters ◽

Medical Sciences ◽

Respiratory Mortality ◽

Daily Data ◽

Disease Mortality ◽

Different Seasons ◽

Cardio Vascular

Introduction: Industrialization and the growing of urbanization have increased the amount of contamination and have a devastating impact on the population health; the aim of this study was the relationship between pollutants and some climatic parameters on mortality of heart and respiratory diseases in Shiraz Methods: The study was an analytical one. Firstly, daily data on climate elements (temperature, humidity, pressure, wind) from Shiraz Meteorological Office (2004-2014), daily information on air pollutants (CO, PM, NO2, SO2, O3) from Shiraz General Environment Department and cardiovascular and respiratory mortality rates from Shiraz University of Medical Sciences was collected, respectively. Data were analyzed using software SPSS ver. 22; statistical methods and correlation coefficients of monthly, seasonal and monthly averages and mortality rates were investigated. Results: Results of this study indicated that there was a significant correlation between the parameters of the climate (humidity, pressure, temperature and wind) and deaths from cardio - vascular and respiratory diseases at the level of 0.99 and 0.95 (**=P<0/01, *=P<0/05). There was a statistical difference between the mortality rates in different seasons in Shiraz and the mortality rates caused by the cardio vascular and respiratory diseases were relatively more sensitive to climate parameters. Conclusion: In general, during the statistical period, no polluted day was observed in polluted O3, NO2 in Shiraz City, relationships between other pollutants and mortality rates were significant. This correlation is shown by a 1-5 day delay for pollutants of CO, PM10and 6-10 days for pollutants of SO2.

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Ozone, Fine Particulate Matter, and Chronic Lower Respiratory Disease Mortality in the United States

American Journal of Respiratory and Critical Care Medicine ◽

10.1164/rccm.201410-1852oc ◽

2015 ◽

Vol 192 (3) ◽

pp. 337-341 ◽

Cited By ~ 41

Author(s):

Yongping Hao ◽

Lina Balluz ◽

Heather Strosnider ◽

Xiao Jun Wen ◽

Chaoyang Li ◽

...

Keyword(s):

United States ◽

Particulate Matter ◽

Respiratory Disease ◽

Fine Particulate Matter ◽

The United States ◽

Fine Particulate ◽

Disease Mortality ◽

Lower Respiratory Disease

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Development of a Non-Linear Integrated Drought Index (NDI) for Managing Drought and Water Resources Forecasting in the Upper Tana River Basin-Kenya

International Journal of Environmental Sustainability and Green Technologies ◽

10.4018/ijesgt.2020010102 ◽

2020 ◽

Vol 11 (1) ◽

pp. 15-33

Author(s):

Raphael Muli Wambua

Keyword(s):

Water Resources ◽

River Basin ◽

Lead Time ◽

Drought Index ◽

Meteorological Data ◽

Principal Component ◽

Drought Forecasting ◽

Tropical River ◽

Tana River ◽

Non Linear

This article uses the non-linear integrated drought index (NDI) for managing drought and water resources forecasting in a tropical river basin. The NDI was formulated using principal component analysis (PCA). The NDI used hydro-meteorological data and forecasted using recursive multi-step neural networks. In this article, drought forecasting and projection is adopted for planning ahead for mitigation and for the adaptation of adverse effects of droughts and food insecurity in the river basin. Results that forecasting ability of NDI model using ANNs decreased with increase in lead time. The formulated NDI as a tool for projecting into the future.

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