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Proceedings Paper

Surface ozone measurements using differential absorption lidar
Author(s): Sohan Lal Jain; B. C. Arya; Sachin D. Ghude; Arun Kumar Arora; Randhir K. Sinha
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Paper Abstract

Human activities have been influencing the global atmosphere since the beginning of the industrial era, causing shifts from its natural state. The measurements have shown that tropospheric ozone is increasing gradually due to anthropogenic activities. Surface ozone is a secondary pollutant, its concentration in lower troposphere depends upon its precursors (CO, CH4, non methane hydrocarbons, NOx) as well as weather and transport phenomenon. The surface ozone exceeding the ambient air quality standard is health hazard to human being, animal and vegetation. The regular information of its concentrations on ground levels is needed for setting ambient air quality objectives and understanding photo chemical air pollution in urban areas. A Differential Absorption Lidar (DIAL) using a tunable CO2 laser has been designed and developed at National Physical Laboratory, New Delhi, to monitor water vapour, surface ozone, ammonia, ethylene etc. Some times ethylene and surface ozone was found to be more than 40 ppb and 140 ppb respectively which is a health hazard. Seasonal variation in ozone concentrations shows maximum in the months of summer and autumn and minimum in monsoon and winter months. In present communication salient features of experimental set up and results obtained will be presented in detail.

Paper Details

Date Published: 12 January 2005
PDF: 9 pages
Proc. SPIE 5653, Lidar Remote Sensing for Industry and Environmental Monitoring V, (12 January 2005); doi: 10.1117/12.578168
Show Author Affiliations
Sohan Lal Jain, National Physical Lab. (India)
B. C. Arya, National Physical Lab. (India)
Sachin D. Ghude, National Physical Lab. (India)
Arun Kumar Arora, National Physical Lab. (India)
Randhir K. Sinha, National Physical Lab. (India)

Published in SPIE Proceedings Vol. 5653:
Lidar Remote Sensing for Industry and Environmental Monitoring V
Upendra N. Singh; Kohei Mizutani, Editor(s)

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