As the main economic, administrative, cultural and tourist center, Cairo has many government offices, institutions, business centers, hotels, and the oldest university in the Islamic world – Al-Azhar.
The city is a major commercial and industrial center of Egypt, but if you live in Cairo, it would be like a daily pack of cigarettes smoked, even if you are not a smoker. With its high levels of pollution the Egyptian capital ranks among the leaders in this list. Another general problem is lead contamination, due to the fact that Egypt is not using unleaded petrol. Often over the city can be seen a thick black cloud formed by burning waste from rice farmers, and thereby emit poisonous substances.