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Nitrogen dioxide and oxidant in an urban region of Delhi, India

Kapoor, RK and Singh, G and Tiwari, S and Ali, K (1991) Nitrogen dioxide and oxidant in an urban region of Delhi, India. Energy and Buildings, 16 (1-2). pp. 683-689.

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Abstract

In urban areas, trace gases may constitute a sizeable fraction of man-made pollution. Therefore, a precise knowledge of their concentration and variance is relevant for any information on environmental pollution. Considerable interest has culminated in a study of these gases in different regions on account of their impact on climate, solar radiation and human health. Nitrogen dioxide and total oxidant were monitored at the rate of two litres per minute, on days of measurements, for a period of two hours from 05:00 to 07:00 GMT during December 1982 to March 1987 at an urban location in the Delhi region and concurrent meteorological observations were also taken. The sampling site was the terrace of the Institute's building (height ≈ 15m) situated on a ridge near the National Physical Laboratory. The principal seasons of the year are December to March (winter), April to June (pre-monsoon), July to September (monsoon) and October to November (post-monsoon). From the data collected, mean concentrations of the pollutants and their variations over different seasons and years were studied, together with their relationships with various meteorological observations. It was found that, on a monthly basis, computation of the correlation coefficient between nitrogen dioxide and oxidant was -0.22 which was not statistically significant at the 10% level. Mean concentration of nitrogen dioxide was found to be more on overcast days compared to clear days. Studies suggested the significance of photochemistry and the possibility of intrusion of stratospheric ozone into the troposphere. Details of the investigations are presented

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier
Uncontrolled Keywords: Meteorology; Nitrogen Oxides; Ozone, Nitrogen Dioxide; Oxidants; Trace Gases; Urban Regions, Air Pollution
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 02 May 2015 04:17
Last Modified: 02 May 2015 04:17
URI: http://moeseprints.incois.gov.in/id/eprint/1118

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