Like Beijing, people in Xi’an suffered from the poor air condition every winter. For the geography reason, it’s hard to snow or rain in Xi’an in winter, take this year for example, it was snowed once or twice. These snow turned into water as soon as it hit the ground.
Thus, air condition is really hard to change if there is no wind coming.
In there weather forecast of Xi’an, you can see a haze icon. When people breath, it can be felt that something is in the air. Inside the room is no better, unless you have a functional air filter.
The picture is the view out of my office. It seems much better than the morning. The entiry city just like “Slient Hill”. In these days, blue sky is something only can be seen in TV.