EVALUATION OF AMBIENT AIR QUALITY STATUS OF BANGALORE CITY USING GIS

Rajshekar S Hiremath, DR MAYANAIK, NAIK

Abstract


The present study aims to evaluate the Ambient Air Quality status at ten prominent locations in Bangalore city for the year 2012 and 2013. This paper highlights the possible causes of worsening air quality. The selected sampling sites represent three different anthropogenic activities consisting of sensitive, residential, commercial and industrial area. The selected parameters, to judge the quality of air, were Sulphur Dioxide (SO2), Nitrogen Dioxide (NOx) Respirable Suspended Particulate Matter (RSPM) which gives a fair idea of the pollution load carried by the air. The data is interpreted in the form of general patterns, average values and seasonal variations.
The annual average concentration of RSPM was well above the prescribed standards at all the selected sites, however concentration of SO2 was much below the national standards, but NOx was although below the permissible limits showed an increasing trend. Exceedence Factors calculated show that all areas are severely polluted as far as RSPM is concerned and low to moderately polluted for SO2 and NOx respectively. The average of SO2, NOx and RSPM concentrations were found to be 13 to 16µg/m3 and 13 to 15µg/m3, 29 to 31µg/m3 and 27 to 30µg/m3, 62 to 184µg/m3 and 74 to 169µg/m3 respectively. This study reports that the maximum SO2, NOx and RSPM values occurred during the winter with minimum values occurring in the summer, which can be attributed to a combination of meteorological conditions and photochemical activity.
Whereas in the seasonal variations, RSPM concentration was above the safety limits, SO2 was found to be below the National Ambient Air Quality Standards (NAAQS) and NOx showed an increasing trend over the years at all the sites. Results show that RSPM was the prominent pollutant in the ambient air environment of Bangalore city. Spatial interpolation was carried out using Inverse Distance Weighted Technique (IDWT) to create GIS maps, depicting the ambient air quality contours, which explains the changes in the ambient air quality characteristics.

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ISSN : 2251-1571