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Abstract

Aerosol size distributions were measured at three stations in Kolkata city, during December 2003 to February 2004 using an 8-stage cascade impactor with a back-up filter. Hi-volume samplers were used at the 3 sites for measuring PM2.5 and PM10 concentration. The results showed that the total average number distributed in the size range of 0 to 10 μ m for particulates of size Dp could be represented as a Junge distribution dN/d log(Dp) = 1282.6 (Dp) − 3.803. Aerosol mass distribution by size showed that of the collected fractions most of the PM10 were in the size range of 0 ≤ Dp ≤ 0.43 μ m (15.73%) followed by 0.65 ≤ Dp ≤ 1.1 μ m (15.72%) and then 0.43 ≤ Dp ≤ 0.65 μ m (14.73%). Particle size distributions were trimodal with fine mode Dp ≤ 1.1 μ m (MMAD = 0.51 μ m, GSD = 2.15), medium mode 1.1 ≤ Dp ≤ 4.7 μ m (MMAD = 2.53 μ m, GSD = 1.54) and coarse mode 4.7 ≤ Dp ≤ 10 μ m (MMAD = 8.16 μ m, GSD = 1.38). Average concentrations of PM2.5 and PM10 were in the range of 96.31–363.63 μ gám ⁻ ³and 140.50–637.70 μ gám ⁻3, respectively. Correlation analysis showed that the highest correlation (0.91) was observed between the particle ranges of 9.0–10.0 μ m and 3.3–4.7 μ m followed by 0.89 between 9.0–10.0 and 5.8–9.0 μ m. Regression analysis showed that PM2.5 was about 60% of PM10 concentration. A widely used ICRP model was used to estimate pulmonary deposition. The result showed that 36% of deposited PM10 was accumulated in the alveolar region and nearly 49% of deposited PM10 was accumulated in the tracheobronchial region.

Keywords

PM2.5 PM10 Aerosol Log-normal distribution Trimodal distribution ECD Pulmonary deposition

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Size Distribution of Atmospheric Aerosols in Kolkata,India and the Assessment of Pulmonary Deposition of Particle Mass

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