A Photographic Investigation of Tehran's Light Pollution from North and East Directions

Tehran is the most affected town by light pollution in Iran. In this study, the role of the regional topography in the distribution of light pollution in Tehran was evaluated by recording digital images and analyzing the obtained images from Tehran sky-glow by East and South in standard imageprocessing software. The scale of Tehran's glowing dome as measured bySouth is 17 mag/arc sec2 or 0.017 cd/m2, and 18.7 (mag/arc sec2) or 0.0035 cd/m2 by East. Considering the approximately equal distance of the two viewpoints from the center of Tehran city, the calculated scale of Tehran's glowing dome by South is 1.36 times larger than from the East point.