it is concentrated in shahrhar metropolis, we are now in shahrehar metropolis of tehran karaj, the residential ​​karaj and tehran, 14 million people, we concentrated here, causing nat. various secrets in the discussion of weather, wind currents, even the studies that have been done, the air temperature has actually increased in this area, the wind currents have decreased , changed direction, air pollution has increased, and traffic and even social damage, food files, studies that done to the extent that the population density increases in a region , it is directly related to the increase in social harms such as divorce, and i would like to say that the increase in food costs, therefore, one of the goals is to reduce the density. it is in the country and the distribution of the population, in the villages, in the small towns, where 120 of our cities are actually under 500 thousand people, which is actually the main goal in this section, and you also consider a geographical explanation that is appropriate to the population, according to the purpose of the land. the thing that is the main neglect