نتایج جستجو برای: pollutant sources
تعداد نتایج: 307281 فیلتر نتایج به سال:
OBJECTIVE To estimate the attributable and targeted avoidable deaths (ADs; TADs) of outdoor air pollution by ambient particulate matter (PM10), PM2.5 and O3 according to specific WHO methodology. DESIGN Health impact assessment. SETTING City of Valladolid, Spain (around 300 000 residents). DATA SOURCES Demographics; mortality; pollutant concentrations collected 1999-2008. MAIN OUTCOME M...
The momentary maximum concentration of the most important air pollutants (nitrogen oxide, sulfur dioxide, carbon monoxide and dusts) was determined using the dispersion curves of the pollutants in the densely inhabited areas of Dâmboviţa County. In order to present the industry-wide potential impact of air pollutants on the population and on the environment, maps showing air pollution levels ha...
BACKGROUND The relationship between traffic emissions and mobile-source air pollutant concentrations is highly variable over space and time and therefore difficult to model accurately, especially in urban settings with complex terrain. Regression-based approaches using continuous real-time mobile measurements may be able to characterize spatiotemporal variability in traffic-related pollutant co...
Air pollution had become a vital concern for the 2014 Youth Olympic Games in Nanjing. In order to control air pollutant emissions and ensure better air quality during the Games, the Nanjing municipal government took a series of aggressive control measures to reduce pollutant emissions in Nanjing and its surrounding cities during the Youth Olympic Games. The Air Quality Index (AQI) is an index o...
A three-dimensional meteorological model and a Lagrangian particle dispersion model are used to study the eects of a uniform large-scale wind on the dispersion of a non-reactive pollutant in a coastal region with complex terrain. Simulations are carried out both with and without a background wind. A comparison between model results and measured data (wind and pollutant concentrations) indicate...
OBJECTIVE We systematically reviewed epidemiologic studies on ambient air pollution and congenital anomalies and conducted meta-analyses for a number of air pollutant-anomaly combinations. DATA SOURCES AND EXTRACTION From bibliographic searches we extracted 10 original epidemiologic studies that examined the association between congenital anomaly risk and concentrations of air pollutants. Met...
OBJECTIVE To investigate the seasonal characteristics and the sources of elements and ions with different sizes in the aerosols in Beijing. METHODS Samples of particulate matters (PM2.5), PM10, and total suspended particle (TSP) aerosols were collected simultaneously in Beijing from July 2001 to April 2003. The aerosol was chemically characterized by measuring 23 elements and 18 water-soluble...
BACKGROUND There is growing concern of health effects of exposure to pollutant mixtures. We initially proposed an Environmental Risk Score (ERS) as a summary measure to examine the risk of exposure to multi-pollutants in epidemiologic research considering only pollutant main effects. We expand the ERS by consideration of pollutant-pollutant interactions using modern machine learning methods. We...
Continuous measurements of the air pollutant concentrations at monitoring stations serve as a reliable basis for air quality regulations. Their availability is however limited only at locations of interest. In most situations, the spatial distribution beyond these locations still remains uncertain as it is highly influenced by other factors such as emission sources, meteorological effects, disp...
Overview This paper presents the development of a Graphical User Interface (GUI) to a Decision Support System (DSS) for NonPoint Source (NPS) pollution control on watershed scales. The GUI and all components of the DSS are entirely embedded in ERDAS IMAGINE and the system is launched from the main toolbar. The system uses IMAGINE's GIS functions for data storage and pre−processing, SML for hydr...
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