God, Cairo is POLLUTED

Visiting 4 different capital cities in North Africa gets you to terms with how polluted Cairo is. The skies are much clearer and the weather much more pleasant. Although a city like Algiers would be excepted to suffer more from pollution given its topology of mountains. It was not the case, I guess we need to make a larger effort to reduce pollution in Cairo. The more profound pollution in Cairo is the noise. How have we become so loud. I guess the sheer numbers just make living in Cairo a very difficult thing to do