Is there a lot of smog in Yunnan in winter?

Many.

The air quality in Yunnan is poor in winter, and haze weather often occurs, especially in urban areas. The haze lasts for a long time, affecting people's normal life.

Yunnan, referred to as Yunnan (Yunnan), with the provincial capital Kunming, is located on the border of southwest China and is one of the important birthplaces of human civilization. The Yuanmou Man of Yunnan, who lived 1.7 million years ago, is the earliest human discovered in China and Asia as of 2013.