Number and mass of ultrafine, fine and coarse atmospheric particles during different seasons at Agra, India
Journal Title: Journal of Research in Ecology - Year 2012, Vol 1, Issue 1
Abstract
In the urban atmosphere, adverse health effects of airborne particles cause great concern. Some toxicological studies show that ultrafine particles exert a much stronger physiological effect than the same mass of coarse particles due to an increase both in the number and relative surface area as compared to particles of larger size. The present study deals with the particle number, mass, volume and surface area - size distribution of atmospheric particulate matter to determine their relative proportions in the Ultrafine (< 500 nm), Fine (< 2.5μm) and Coarse (< 10 μm) particles at Agra. The particles collected were analyzed for their mass and number simultaneously during winter, summer and monsoon seasons using an optical particle counter Grimm monitor, 31-Channel Portable Aerosol Spectrometer model No: 1.109 in the range of 0.25-32 μm. The results indicated that the average number concentration was highest in summer (286399.1 cm-3) followed by winter (109155.7 cm-3) and monsoon season (67390.68 cm-3). The concentrations were 2.63 and 4.24 times higher during winter and monsoon season than summer months. Higher concentration was attributed to local as well as long range transport of particles. The long range transport of aerosol particles is also supported by back trajectory analysis. The average number concentration of coarse particles was 2.41 times higher in summer season which indicate that dust storms during summer period have major proportion of coarse particles. The wash out effect during monsoon causes significant decrease of particles therefore the concentrations were found to be much lower
Authors and Affiliations
Tripti Pachauri, Vyoma Singla, Aparna Satsangi, Anita Lakhani, Maharaj Kumari K
Keywords
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