Abstract
This study aims at comparative diffusion/ dispersal capacities, seasonal and diurnal pollution potential (i.e., to explain the ability of the atmosphere to stagnate or dilute pollutants) of some industrial areas of Chhattisgarh in India. For this purpose, the meteorological data of two stations viz. Raipur and Korba have been analyzed for the period of five years (1998 -2002) which included four seasonal representative months: winter (January), pre-monsoon (April), monsoon (July) and post-monsoon (October). The analysis shows absence of stable conditions in the daytime and unstable condition in the night in each seasonal representative month. In general, highest mixing height and ventilation coefficient was recorded during April. From the results it has been concluded that daytime is suitable for good dispersion in all the months. The results also suggest that pollutants are well dispersed in April and July. The vertical dispersion of pollutants / contaminants can peak during January and October. As the predominant winds are northerly or northwesterly, any industrial set up should be in the leeward side i.e. in the southerly or southeasterly of the city in order to minimize the effect of pollutants. This study indicates more conducive atmosphere around Raipur.
Highlights
Raipur, situated in the central part of Chhattisgarh, lies between latitude 19 o 57/ N to210 53/ N and longitude 81o 25/ E to 830 38/ E and at an altitude of 298m a.m.s.l. is the capital town of newly found state – Chhattisgarh
This study indicates more conducive atmosphere around Raipur
Chattisgarh is a mineral rich, land locked state enveloped by Maharashtra, Andhra Pradesh, Orissa, Bihar, Uttar Pradesh and Madhya Pradesh
Summary
Raipur, situated in the central part of Chhattisgarh, lies between latitude 19 o 57/ N to. This study aims to analyze the role of climatological factors in the dispersal or diffusion of air pollutants released in to the atmosphere of Raipur and Korba in order to assist in industrial zoning as well as city/ state or country industrial planning. Radiosonde data (upper air) of two stations viz. Raipur and Korba (Pendra) for the period 1985-89 (Jan., Apr., July., Oct.) for the levels from surface to 700 mb at 00 GMT has been analysed for upper air wind roses, inversions, mixing heights and ventilation coefficients. Better dilution of the pollutants leading to reduction in the ground level concentration is expected at Korba compared to Raipur due to stronger winds. It has been inferred that the occurrence of calm winds in the evening can accumulate and stagnate the pollutants leading to increased ground level concentrations deteriorating. October 10.4 16.7 14.4 9.7 5.8 0.8 12.3 31.8 continues to exceed the temperature curve, wet processes like
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