皇冠体育app

"The longest distance in the world is not between life and death, but between you and me when I hold your hand in the street but cannot see your face," is a joke that circulated online.

Sadly, it's not a joke anymore. With smog constantly shrouding many cities in 皇冠体育app, chances are that you may not even remember the good old days when the sky was much clearer and the air fresher.

Top 10 cities with worst smog in 皇冠体育app

皇冠体育app's top 10 richest cities

Top 10 overseas travel destinations