It's insanely bad. I was there just recently and the sun (if visible) is always orange in color, with half mile visibility or less on an average day when AQI was about 360.
I live in Beijing and the pollution here is pretty bad at many points during the year (the current streak is not even close to the worse I've seen here).
But I'm always amazed by how much emphasis is placed on China in this regard. I try to follow AQI indexes for comparison and India has multiple cities trending over China most of the time. However, news pieces about it are kind of rare...