Volume No. 9 Issue No.: 4 Page No.: 1088-1094 April June 2015

 

WEEKDAY/WEEKEND DIFFERENCES IN CONCENTRATIONS OF OZONE, OXIDES OF NITROGEN AND CARBON MONOXIDE AT A BUSY ARTERIAL ROAD IN DELHI, INDIA

 

Gaur Manisha*1, Singh Rina and Shukla Anuradha2

1. Academy of Scientific and Innovative Research (AcSIR), Central Road Research Institute (CRRI), New Delhi (INDIA) 2. Environment Science Division, Central Road Research Institute (CRRI), New Delhi (INDIA)

 

Received on : January 22, 2015

 

ABSTRACT

 

The rapid increase in the number of motorized vehicles in Delhi has a significant impact on human health as well as in the production of tropospheric ozone and its precursors. This paper discusses the variations in concentration of O3, NO, NOx and CO with traffic during the weekday and weekend. The site selected for the study is adjacent to a heavily trafficked road section with an average traffic flow of approx.165, 000 vehicles per day. Monitoring was carried out during the winter month. A negative correlation was observed between NOx and O3 during the study, indicating a possible VOC sensitive characteristic of the study area. It was observed that on weekdays the concentration of NOx, NO and CO increased between midnight and early morning, which may be due to the increase in the number of heavy vehicles (trucks) running on diesel fuel. The strong weekend effect of ozone was observed due to the decrease in the levels of CO and NOx and carryover of ozone on weekends. Further ozone destruction was observed to be less due to decreased NO levels, indicative of less traffic during the weekends. While strategies for reducing pollution from primary pollutants have been given due importance, controlling a secondary pollutant like ozone requires an extensive research based on emissions of different precursors and meteorological conditions.

 

Keywords : Volatile organic compound, Traffic flow, NO, NOx, CO, O3,

 

 

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