Hey, I just started working here in Wuhan CHina, and although it was a huge shock at first, It's not so bad. I've heard it's pretty similar all over china. No matter where you go, you're going to feel the culture shock. We are very spoiled in Canada with regards to cleanliness etc, due mainly to the fact that for such a large country, our population is relatively small.
I would recomend buying a mask if you're going into the big cities and want to avoid being affected by the smog, it's not so bad here in Wuhan though.
:)