Pintof, I worked for a Hainan subsiduary in HKG, all the Chinese airlines lie/BS about T%Cs but Hainan are among the worst, in Beijing you will likely stay in the Hainan compound, a place that most backpackers would snub.
Also do a bit of googling about the pollution in China, then if you have a family and bring them to China, you should be jailed for spousal/child abuse. If you are single and a non-smoker, well you are about to subject your lungs to far more poison than any smoker in a " normal " country.
Yes, I know its all in my mind, but try telling that to the 1000s that die from pollution every year and the 10s of thousands that lead an unhealthy miserable life.
Here you go Amazing Pictures, Pollution in China | ChinaHush