AIR QUALITY MODELING AND ITS HEALTH IMPACT ALONG THE NATIONAL HIGHWAY 7 IN TAMIL NADU, INDIAP. SHIYAMALA DEVI AND G. VIMALA ROSALINE*Abstract Vehicular pollution control deserves top priority as the air pollution load in urban areas experience an increasing trend. Highway expansion from 2 lane to 4 lane was envisaged to reduce the peak traffic jam in the daily traffic volume along the National Highway 7 in Tamil Nadu. One of the main reasons for selecting the Salem-Namakkal stretch of National Highway 7 in Tamil Nadu for this study is because of the emergence of 12 numbers of schools, 3 numbers of educational institutions and a hospital adjacent to the study area with no sound proof facilities from exposure to traffic emissions. This study emphasizes on the possible health impacts due to the degradation in air quality. The linear regression model is used for air quality modeling along National Highway 7 and is validated by the observed values of the concentrations of NO2, SO2 and PM10. Air Quality Index along the study area implies the change over from unhealthy conditions for sensitive groups to very unhealthy condition. The concentrations of PM10 and NO2 resulted in a hike from Pre project to Post project, while the SO2 concentration were well within the permissible values.
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