نتایج جستجو برای: particulate dispersion
تعداد نتایج: 89627 فیلتر نتایج به سال:
A significant proportion of the atmospheric pollution that exists particularly in urban areas arises from road vehicles and primarily cars. The European Commission (EC) have introduced a series of regulations, the so called EURO Emission directives from Euro I in 1991 to the present day Euro IV. This legislation and similar ones in other global regions have helped to greatly reduce emission lev...
Meteorological "elds are required inputs for air-quality models, but they can contain signi"cant errors which contribute to uncertainties in simulations of airborne chemical species, aerosols and particulate matter. Atmospheric states can be diagnosed from observations or simulated by dynamical models (with or without four-dimensional data assimilation, FDDA). In general, diagnostic models are ...
Gas-to-Particle Conversion Process between Ammonia, Acid Gases, and Fine Particles in the Atmosphere
Ammonia emissions are associated with many agricultural operations including animal and poultry operations, waste and wastewater treatment operations, and fertilizer and manure land applications. The fate of ammonia released to atmosphere is affected by interaction with other gases, aerosols, and fine particles. These interactions affect the gas-to-particle conversion. This process alters ammon...
Continuous measurements of meteorological parameters, gaseous pollutants, particulate matters, and the major chemical species in PM2.5 were conducted in urban Hangzhou from 1 September to 30 November 2013 to study the potential sources and formations of PM2.5 pollution. The average PM2.5 concentration was 69 μg ̈m ́3, ~97% higher than the annual concentration limit in the national ambient air qua...
During the past few years a considerable amount of information has been accumulated on the optical rotatory dispersion of biologically significant compounds. Optical rotatory dispersion data has, in several instances, been useful in elucidating structural details of molecules, such as those of certain proteins. The optical rotations of several lipid and hydrocarbon compounds are also known. On ...
Emergence of airborne ultraane particles (UFPs; those below 100 nm in diameter) in both indoor and outdoor urban settings is continuously attracting attention of the air quality science and management communities worldwide due to their probable adverse impacts on human health and the environment. A simple mean to visualise their tiny size is that the width of a single human hair can accommodate...
Background and Objective: The presence of fungal bioaerosols in hospitals indoor environments have affected the health of patients with the defect in immunity system. Therefore, determination of the rate and species of these agents is essential. This study aimed to investigate association between fungi contamination and particulate matter (PM10, PM2.5 and PM1) concentrations in the main indoor ...
BACKGROUND Although the dispersion model approach has been used in some epidemiologic studies to examine health effects of traffic-specific air pollution, no study has evaluated the model predictions vigorously. METHODS We evaluated total and traffic-specific particulate matter < 10 and < 2.5 microm in aero-dynamic diameter (PM(10), PM(2.5)), nitrogren dioxide, and nitrogen oxide concentratio...
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