Performance Evaluation of AERMOD and ADMS-Urban Models in a Tropical Urban Environment

Jun 21st, 2015
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The presence of sulphur and nitrogen oxides in ambient air is known to increase the risk of visibility impairment and respiratory and cardiovascular morbidity as well as mortality (USEPA, 2008). Though, sulphur oxides are present in low levels in ambient air in Delhi, an increasing trend has been observed in nitrogen oxide levels (CES, 2006 and 2007).

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Performance Evaluation of AERMOD and ADMS-Urban Models in a Tropical Urban EnvironmentManju Mohan1, Shweta Bhati 1 and Pallavi Marrapu 21Centre for Atmospheric Sciences, Indian Institute of Technology,Hauz Khas, New Delhi-110016; (Email: mmohan65@yahoo.com)2 Center for Global and Regional Environmental ResearchThe University of Iowa, 424 IATL, Iowa City, USAAbstractIn this paper an attempt has been made to undertake performance evaluation of the two well-known regulatory models, AERMOD (07026) and ADMS-Urban (2.2) for a tropical city such as Delhi in India. The model is applied to estimate ambient air concentrations of SO2 and NO2 for the years 2000 and 2004 over seven sites in Delhi. Both model evaluation and inter-comparison is performed. It has been found that though both the models have a tendency towards over-prediction, most of estimated values by both models agree with the observed concentrations within a factor of two. The models include all the urban sources (ie. elevated point sources, vehicular traffic, domestic etc.) in a city. Model validation is discussed in the light of emission inventory, requisite meteorological inputs and state-of-the art performance measures. Keywords: Air Quality Modeling, Model Evaluation, AERMOD, ADMS-Urban, Regulatory Models1. IntroductionThe presence of sulphur and nitrogen oxides in ambient air is known to increase the risk of visibility impairment and respiratory and cardiovascular morbidity as well as mortality (USEPA, 200

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