الفهرس 
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Abstract
Hydrogen sulfide is a colorless, flammable gas with a distinctive smell of rotten eggs. It is formed naturally and by human activity. Natural sources involve sulfate breakdown of unspecific and anaerobic bacteria and organic matter that contains sulfur. Hydrogen sulfide is found naturally in petroleum, natural gas, and volcanoes’ gases. It is found in groundwater. It is produced from water that is stagnant or contaminated, and from compost or mining pits. It can be created using a range of industrial processes (Agency for Toxic Substances and Disease Registry (ATSDR), 2006).
Recovery as a byproduct of purifyingnatural and refinery gases is the principal source of hydrogen sulfide. It is also a by-product of the paper industry by kraft method and carbon disulfide manufacturing. It is used as a middle-way product in the production of sulfuric acid and inorganic sulfides and as an agricultural disinfectant. It is also formed as a decomposition product of xanthates (used in the mining industry) when they react with water (Rao & Somasekhara, 2014).
Most of the human data is extracted from clinical studies of severe poisoning, occupational exposures, and numbered community studies. The odor limit depends significantly on the individual; hydrogen sulfide has the geometric mean odor threshold of human health aspects 511 pg/m3. At concentrations higher than 140 mg/m3, olfactory paralysis occurs, which makes hydrogen sulfide extremely dangerous, that a few breaths at 700 mg/m3 can be fatal. Brief-term exposure to inhale-able high concentrations of hydrogen sulfide tends to induce health effects in many systems; the reported effects include death and pulmonary, ocular, neurological, cardiovascular, metabolic and reproductive effects in humans after exposure to hydrogen sulfide. (Hosseinzadeh, 2014).
AERMOD, the recommended model by the US EPA, has been used to model the Distribution of various air pollutants, including Hg, SO2, NOx, PM10, and H2S. AERMOD uses a Gaussian and a bi-Gaussian approach in its dispersion models. It can calculate from hourly to the average of the annual concentrations of pollutants in ambient air. The model handles a variety of pollutant sources in a wide range of settings, such as rural and urban, as well as flat or complex terrain (Hosseinzadeh, 2014).
1.1 Aim of the study
This study aims at applying the AMS/EPA Regularity Model (AERMOD) in the prediction of the dispersion of Hydrogen sulfide gas emitted from a water area source in air, taking Lake Maryout as a case study. This is done considering Lake Mariout as an