I I remember saw a post that one American has encountered 2 good English speaking girls at the Tian’an Men square, and wonder whether they have good intention or not, however I cannot locate that post so I opened a new one.
I just read from the newspaper, that there are some girls hanging around the square and approach foreigners saying “how are you, is this first time visiting Beijing, how do you like Beijing” etc. Then they will invite you for a cup of tea or drink, to a bar which they have contract with. Usually the cost of which, is more than 1000RMB (USD 150), sometimes the cost is over USD 300.
Therefore, except the dirty fog in the square, that’s another thing to be aware.