In summary, the methodology used is as follows: first, the required data was
collected and then relationships were created to estimate PM or SO2 concentrations by
using the regression analysis. Only the relationships that satisfied all criteria of the
regression analysis were used. The selected relationships were tested for validation using
different data sets. The sensitivity analysis of the relationships was also done
theoretically using mathematical methods. Finally, the relationships were entered into
the PCI Geomatica program to create maps showing PM and SO2 concentration
distributions. The data required for developing the equations are measured PM10, PM2.5,
and SO2 concentrations. Landsat TM/ETM+ data are of the same dates as those of
measured PM and SO2 concentrations.