نتایج جستجو برای: background concentrations
تعداد نتایج: 1108431 فیلتر نتایج به سال:
At present, continuous observation data for atmospheric nitrous oxide (N2O) concentrations are still lacking, especially in east Antarctica. In this paper, nitrous oxide background concentrations were measured at Zhongshan Station (69°22'25″S, 76°22'14″E), east Antarctica during the period of 2008-2012, and their interannual and seasonal characteristics were analyzed and discussed. The mean N2O...
Policy Relevant Background (PRB) ozone concentrations are defined by the United States (U.S.) Environmental Protection Agency (EPA) as those concentrations that would occur in the U.S. in the absence of anthropogenic emissions in continental North America (i.e., the U.S, Canada, and Mexico). Estimates of PRB ozone have had an important role historically in the EPA's human health and welfare ris...
A simple dispersion model for calculation of urban background concentrations, similar to the one used for Copenhagen in Denmark, has been developed for Sweden (SWE-BUM). The model calculates concentration on a 1 x 1 km grid and is, within the national Air Quality system SIMAIR, operationally applied for 150 cities in Sweden. In this study, a simple stability parameterisation is implemented in t...
Н основе анализа суточной и месячной динамики получены фоновые значения, которые могут впоследствии использоваться для управления качеством атмосферы в рамках квотирования выбросов. Полученные оценки верифицировались с использованием официальных методических указаний. Показано, что методики дают близки значения фоновых концентрация более длительных периодов наблюдений. Tropospheric ozone is one...
background lead is a toxic metal with a poor electrical conductivity. this metal can be hazardous and poisonous even in low concentrations. objectives the objective of this study is the evaluation of prosopis mimosaceae sawdust as a low-cost adsorbent for removal of the lead from effluents. materials and methods the experiment was conducted in a batch system and the effect of ph, the amount of ...
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