Attenuation due to aerosols restricts the distance of FSO communication systems and
limits the availability for line-of-sight terrestrial link. This work is focused on the
effect of aerosols on the FSO link. The attenuations was studied in the Hilla city in
the aerosols phenomena for three selected wavelengths (532, 1064, and 10600 nm)
for horizontal transmitting range (1-10) Km. The results show that system availability
as a function of the range, and indicate that FSO systems can be deployed with
reliability in Hilla city of Iraq.