CO is one of the main air
pollutant which leads to many problems for human. Mega cities such as Tehran
have critical issues by increasing the vehicles, fuel usage and urban area
expansion. Hence, to have a clear view points on the pattern of CO
concentration in Tehran, the data of 14 air quality concentration centers in a
midterm period (2009 and 2012) are used. The main novelty of this research is
using the third quartile (Q3) as the pollution indicator which leads to more
accurate results based on the exposure pattern in a day. Additionally, by
Spline interpolation model and using ArcGIS software the zoning maps to show
the CO concentration in urban area are illustrated and discussed. Using Q3
instead of the mean values showed more accurate results due to the exposure
patterns. Due to the results, the CO concentration shows a downward trend and
the most changes are in the Western side of the city.
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