2004 International Archives of the Photo 
  
      
s of 6. CASE STUDY 
eled 
ho The monitored raw environmental data include error. The 
2 0 
data from Sorkhehesar, Tajrish, Gholhak, Bahman, Vila, 
Pardisan and Azadi air pollution monitoring stations in 
vers Tehran in 2002 was stored in Excel software. Then pollutant 
d is Standard index (PSI) was calculated in daily, monthly and 
yearly interval by programming using Visual Basic as 
discuss in [Rahmatizadeh, 2003]. Database joined to digital 
map. Spatial Analysis module was used for interpolation in 
three dimensions. Inverse distance interpolation is used for 
modeling between the monitoring stations. This method of 
interpolation combines the idea of Thiessen polygon with the 
  
  
  
M) gradual change of trend surface. It considers weighted 
moving average. Weights are computed from a linear 
rent function of distance between sets of points and the points to 
ould be predicted. In this method the size of the starting radius is 
. In specified, which defines the starting search area for 
ally interpolation points around grid point. Figure 2 shows spatial 
del, dispersion of TSM in June 2002. Similarly such map was 
and produce for the other pollutants. 
the 
the 
base 
ides June 2002 
atial 
ical 
| or 
jad Station. dbf 
? Surface from ZMap 20620: 
E 58-75 
75.100 
100 - 125 
NT 125.150 
150 - 175 
No Data 
the 
n of e: 
10 9 19 20 Klometers : 
mss 
the 
ling : d iidem “TSM in J 5 
tof Figure 2.Spatial dispersion of TSM in June 200 
[an 
it of Considering the standards used, good, moderate, unhealthy, 
for very unhealthy and dangers places were determined 
[Rahmatizadeh, 2004]. Figure 3 shows the spatial dispersion 
of CO in November 2002. 
CO 
November 2002 
; p MA 
ven MISC SP nt tatin A W0 
rc err A 
the P, A Med Y (4:5 37 
! | vemm {hig tle P 
ical eae 22 © | "s i 4 im 9 2 i " 
the cere DI AES af 5, Qn ED 
ned. ea 21 ] rs D jen 1 ^ + Station 
smit Yreka) oe), = Moderate 
: i Y S \ L. imd 
lity jo ame) B. 
\ fry Aa Danger 
LG X 20 € No Data 
)ase Ur x 
eing A, 
and ur 
map 10 0 10 : 20 Kitometers : 
atial 
oral 
Figure 3.Spatial dispersion of co in November in 2002 
1113 
srammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
Following statistical analysis draw chart foe each station. 
Figure 4 shows the trends of four important pollutants in 
Bahman air pollution station in 2002. 
Bahmani Station in 2002 
  
  
  
  
^ 
CO 
  
  
—— Dustc 
NO2 
— 20% 
  
  
  
  
  
  
  
Figure 4.The trends of four pollutants in Bahman station in 
2002 
There is a strong wind blow in Tehran during last summer 
and beginning at autumn, due to specific topographic 
condition and arid or semiarid region of city. In addition, due 
to a number of large deserts including Central desert in Iran 
and finally because of creating heat islands, TSM penetration 
to the city increase. 
Spring season, relative humidity and increased precipitation, 
TSM are deposited. This situation is illustrated in Figure 5. 
         
   
    
  
    
TSM 
TSM 
January 2002 
February 2002 
      
   
  
TSM 
March 2002 
  
   
   
   
TSM 
June 2002