ISSN (Print) - 0012-9976 | ISSN (Online) - 2349-8846

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Pollution, New Bombay and All That

THIS refers to the article "Pollution, New Bombay and All That" (October 21, pp 2139-40). Before discussing the two important questions raised by your correspondent towards the end of his article there is a minor matter which should perhaps be clarified. This relates to the appointment of a foreign consultant to carry out air pollution studies. Your correspondent implies that these could have been carried out by CPHERI, on whose opinion CIDCO had to fall back in any case in the final analysis. The facts are that when approached by CIDCO the World Bank advised that the correct procedure would be to appoint a consultant to carry out a study of the possible pollution effects of the DMCC plant using a mathematical diffusion model. In this type of model the inputs are meteorological data pertaining to the site, in particular wind directions and wind velocities, and information concerning the quality and temperature of the stack discharge gases, and the height at which these will be discharged. Ideally speaking, ground topographical features should also be reproduced, although that was not possible in this case. Various heights of stack can be assumed and tested, and the model finally predicts the anticipated ground level pollution concentrations at varying distances from the stack, in different directions. The World Bank suggested that the work of the consultant appointed to carry out this kind of mathematical model study should be supervised by another independent consultant. CIDCO suggested, and the World Bank accepted, the appointment of CPHERI as the supervising consulting agency. CPHERI however did not know of any agency in India that could do this work immediately. (CIDCO has incidentally started work on developing a mathematical diffusion model which is expected to be ready in about two years' time). The World Bank had suggested a number of foreign consulting firms which were equipped to do this work and of these CPHERI selected GEOMET as the most suitable. GEOMET required meteorological information from the site, and since CPHERI were already engaged on various studies commissioned by CIDCO in its project area, they were able to undertake also the collection of this basic meteorological information.

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