moving to Beijing in Aug 2013

Dear Internations Beijing members,

We are moving from Sweden to BJ in Aug with 2 kids.

- I am looking for home air cleaning solutions. There are so many different products can be found on Taobao but hard to know which is good
- and is there any of you actually use mask when you go out? where do you purchase it, BJ or your home countries?

would appreciate if anyone can give recommendations or tips if you are using one.

Big thanks in advance!
/Weiwei