Comparing two cities of in Iran ------> Please help me to correct it

Tehran is the capital of Iran and is located in the south of the Alborz Mountains at the north of in north Iran. On the other hand, Qazvin is the capital of calligraphy of Iran and is located in the north-west of Iran. Although Tehran and Qazvin are very different, they have a lot of similarities.

While Tehran is full of has many of the best state universities of Iran (I would rephrase this to 'the best universities in the country') like Tehran University, Sharif University, Poly Technic, Iran University of Science and Technology, Tarbiat Modares University, Shahid Beheshti, Tehran University of Medical Science and so on (I would mention one or two universities), Qazvin just has only has two of them universities: Imam Khomeini International University and Qazvin University of Medical Science.

Unlike Tehran, Qazvin has healthy climate and there is are not any traffic problems. Tehran is very big (I would say large), and crowded city with a population of about 12 million people; in contrast, Qazvin is a town with the population of just about one million people. (Instead of 'about' when using numbers, use 'approximately')

Qazvin has been was the capital of Iran in the during the reign of Safavian and is full of has many monuments like Kolah Farangi, Hammame Ghajar, traditional Bazar and so on. Similarly, Tehran has been the capital of Iran in during the reigns of Zandian, Ghajarian, Pahlavi and for this reason is full of contains many monuments.

In conclusion, Qazvin and Tehran are two important cities of Iran and have with a lot of similarities and differences. In my opinion, living in smaller cities like Qazvin is are very beneficial (benificial how? it sounds like you're saying beneficial to one's health but it would help to clarify)  because they have lower population, good weather (what is good weather in your opinion? is it hot? lots of rain? etc) and (therefore) lower levels of stress.

Best regards!