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Distribution of PM 2.5 and PM 10-2.5 in PM 10 Fraction in Ambient Air Due to Vehicular Pollution in Kolkata Megacity



This research paper aims at establishing baseline PM 10 and PM 2.5 concentration levels, which could be effectively used to develop and upgrade the standards in air pollution in developing countries. The relative contribution of fine fractions (PM 2.5 ) and coarser fractions (PM 10-2.5 ) to PM 10 fractions were investigates in a megacity which is overcrowded and congested due to lack of road network and deteriorated air quality because of vehicular pollution. The present study was carried out during the winter of 2002. The average 24h PM 10 concentration was 304 μg/m 3 , which is 3 times more than the Indian National Ambient Air Quality Standards (NAAQS) and higher PM 10 concentration was due to fine fraction (PM 2.5 ) released by vehicular exhaust. The 24h average PM 2.5 concentration was found 179 μg/m 3 , which is exceeded USEPA and EU standards of 65 and 50 μg/m 3 respectively for the winter. India does not have any PM 2.5 standards. The 24 h average PM 10-2.5 concentrations were found 126 μg/m 3 . The PM 2.5 constituted more than 59% of PM 10 and whereas PM 10 -PM 2.5 fractions constituted 41% of PM 10 . The correlation between PM 10 and PM 2.5 was found higher as PM 2.5 comprised major proportion of PM 10 fractions contributed by vehicular emissions.



Environmental Monitoring and AssessmentSpringer Journals

Published: Nov 1, 2006

DOI: 10.1007/s10661-005-9168-3

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