Shiraz
Shiraz (; , "Šīrāz", ) is the fifth-most-populous city of Iran and the capital of Fars Province (Old Persian as Pars). At the 2016 census, the population of the city was 1,869,001 and its built-up area with "Shahr-e Jadid-e Sadra" (Sadra New Town) was home to 1,565,572 inhabitants. Shiraz is located in the southwest of Iran on the "Rudkhaneye Khoshk" (The Dry River) seasonal river. It has a moderate climate and has been a regional trade center for over a thousand years. Shiraz is one of the oldest cities of ancient Persia.
Shiraz
During the Zand dynasty when Shiraz was the capital of Iran, it was a small village limited around the Arg of Karim Khan and naturally there were several villages near it. The north part of old Shiraz (now Qasr al-dasht and Chamran) was completely covered with gardens and green trees that still remain. A number of municipal laws prohibit construction in any of the garden areas. In another view, these gardens are the city's lungs and help to clean the dust, and haze or carbon dioxide that cars produce, by photosynthesis. On the other hand, we see Shiraz as being more likely to have clean air in Iran; this is when it is compared to big cities such as Tehran or Isfahan, and the reason behind it may lie in Shiraz's many gardens.