Any information system is normally a computer-based information system that enables capture, modeling, manipulation, retrieval, analysis and presentation of geographically referenced data. The rise of information technology and its use in a wide range of disciplines provides transportation and air quality modelers with a powerful tool for developing new analysis capability.

Emerging technologies affect the social, economic and environmental dimensions of our world, often in ways that are entirely unanticipated. A study was carried out to assess the concentration of the critical pollutants, such as sulphur dioxide (SO2), nitrogen oxides (NOx) and suspended particulate matter present in the ambient air of a fertilizer industry during the year 2000.

Chennai Metropolitan Area extends over 1180 sq. km and has a population of more than 8.5 million. Rapid increase in urbanization with vehicle congestion has increased menacingly on the roads of Chennai. As a result of this, gaseous pollutants and respirable and suspended particulate matter pollutants are continuously increasing in the ambient air of Chennai city. These pollutants have been assessed using high volume sampler at residential and traffic intersection sampling stations in Chennai City.

Five years air monitoring study was carried out to assess the primary air pollutants present in the ambient air in Chennai city during 1999-2003 at two different sampling stations.