Short-term effects of air pollution on daily asthma-related emergency department visits in an industrial city.

BACKGROUND: Epidemiological studies from Europe and North America have provided evidence that exposure to air pollution can aggravate symptoms in asthmatic patients. METHODS: Daily number of AEDv, air pollution levels (PM10, PM2.5, SO2, NO2 and CO) and meteorological variables was obtained from Jubail Industrial City, Saudi Arabia, for the period of 2007-11. Data were analyzed using a time-series approach. Relative risks (RRs) were estimated using Poisson regression. RESULTS: The associations between AEDv and PM10, PM2.5, SO2 and NO2 remained positive and statistically significant after mutual adjustment in the multi-pollutant model.The RR of AEDv increased by 5.4, 4.4, 3.4 and 2.2% per an inter-quartile range increase in SO2 (2.0 ppb), PM2.5 (36 µg/m3), NO2 (7.6 ppb) and PM10 (140 µg/m3), respectively. No significant associations between AEDv and CO were found. CONCLUSIONS: Current levels of ambient air pollution are associated with AEDv in this industrial setting in the Middle East. Greater awareness of environmental health protection and the implementation of effective measures to improve the quality of air in such settings would be beneficial to public health.

Epidemiology of childhood injuries in Saudi Arabia: a scoping review.

BACKGROUND: Injury is the leading cause of death among Saudi children. Despite that, much remains unknown on the epidemiology and the extent of burden. This scoping review aims to describe previous literature on injury burden, including types, causes, and outcomes. METHODS: We conducted a scoping literature search of English published articles on injuries among Saudi children between 0 to 18 years old using Scopus, MEDLINE, and Web of Science between January 2000 and December 2020. The primary outcome was the type and the cause of childhood injuries. Data extraction was based on specified data elements that included study characteristics and epidemiological parameters. The STROBE checklist was used to assess the quality of publications. RESULTS: The initial review identified 3,384 studies. Of which, 36 studies met the inclusion criteria. A total of 20,136 children were included; of them, 69% were males. Among studies that examined overall injuries, falls represented 31.9%, while 25.1% were due to Motor Vehicle Collision (MVC). The leading cause of fractures was falls (37.9%), followed by MVC (21.5%). The leading cause was flames (52.1%) followed by scald (36.4%) for burns. While for poisoning, medications were the leading cause of (39.9%), followed by toxic household products (25.7%). Weighted mortality rates were 5.2% for overall injuries, 8.3% for fractures of the skull and spine, and 17.4% for burns. CONCLUSIONS: MVC and falls are associated with the highest share of injuries in the kingdom. These findings can guide prevention efforts to reduce injury burden and improve population health. Further population-based research is warranted to explore the determinants of childhood injuries across all regions of Saudi Arabia.

Environmental Risk Factors and Health: An Umbrella Review of Meta-Analyses.

Background: Environmental health is a growing area of knowledge, continually increasing and updating the body of evidence linking the environment to human health. Aim: This study summarizes the epidemiological evidence on environmental risk factors from meta-analyses through an umbrella review. Methods: An umbrella review was conducted on meta-analyses of cohort, case-control, case-crossover, and time-series studies that evaluated the associations between environmental risk factors and health outcomes defined as incidence, prevalence, and mortality. The specific search strategy was designed in PubMed using free text and Medical Subject Headings (MeSH) terms related to risk factors, environment, health outcomes, observational studies, and meta-analysis. The search was limited to English, Spanish, and French published articles and studies on humans. The search was conducted on September 20, 2020. Risk factors were defined as any attribute, characteristic, or exposure of an individual that increases the likelihood of developing a disease or death. The environment was defined as the external elements and conditions that surround, influence, and affect a human organism or population's life and development. The environment definition included the physical environment such as nature, built environment, or pollution, but not the social environment. We excluded occupational exposures, microorganisms, water, sanitation and hygiene (WASH), behavioral risk factors, and no-natural disasters. Results: This umbrella review found 197 associations among 69 environmental exposures and 83 diseases and death causes reported in 103 publications. The environmental factors found in this review were air pollution, environmental tobacco smoke, heavy metals, chemicals, ambient temperature, noise, radiation, and urban residential surroundings. Among these, we identified 65 environmental exposures defined as risk factors and 4 environmental protective factors. In terms of study design, 57 included cohort and/or case-control studies, and 46 included time-series and/or case-crossover studies. In terms of the study population, 21 included children, and the rest included adult population and both sexes. In this review, the largest body of evidence was found in air pollution (91 associations among 14 air pollution definitions and 34 diseases and mortality diagnoses), followed by environmental tobacco smoke with 24 associations. Chemicals (including pesticides) were the third larger group of environmental exposures found among the meta-analyses included, with 19 associations. Conclusion: Environmental exposures are an important health determinant. This review provides an overview of an evolving research area and should be used as a complementary tool to understand the connections between the environment and human health. The evidence presented by this review should help to design public health interventions and the implementation of health in all policies approach aiming to improve populational health.