Usually, when we get angry or face a bad situation, we say, "We’re stressed." Additionally, polluted air can also cause stress.

For instance, people living in villages with plenty of trees and fewer cars or factories experience nervousness very rarely.

Over a hundred years ago, German psychologist Willy Hellpach wrote, "The city is a hub of stress. It’s not only noisy but also has polluted air."

Therefore, try to go out of the city and relax in fresh air as often as possible. It will benefit your nervous system and improve your productivity.