Breathing fresh air may bring so much good to people. Sometimes it is even better that several medical pills. That is why many doctors recommend their patients to go to the seaside or into the forests, as there they may breathe fresh air. Unfortunately, it is impossible to breathe fresh air in highly-industrialized cities. As factories and plants pollute the air so much that smog covers the city. It is even possible to smell harmful essences that get into the air. Humanity suffers from it a lot as the majority of diseases are provoked by the lack of fresh air. Air contains oxygen thanks to which we are still alive.
