Один из моих друзей часто болел. врач говорит, что это потому, что он живет в большом городе с плохой экологией. как ответить на вопрос, на языке?

My friend is sick a lot and the doctors told him that it was all because of the bad air in the city. In many cities, the environment is very bad and in my also very bad environment. Dirty air, smoke and a lot of garbage on the streets. I advised my friend to live in the country because the city is quiet, the air is fresh, there is no urban bustle.