Dear All.. wanted to share a tip with you in case you might need it. I was traveling to an area that had TERRIBLE POLLUTION ( equivalent to smoking a pack of cigarettes per day!) I was very aware of various masks including the 3M N95 but did my "due diligence" and found this (I got a kinda cute one!):

http://www.cambridgemask.com/buy-a-mask/international/ Where I purchase mine .. bought two of them .. shipped from the UK .. was SO happy with them. Very easy to breathe through .. in fact on the plane home was across from a woman with a TERRIBLE cough .. so I wore mine the whole way home and did NOT catch her cold! So I would highly recommend this mask to anyone of us with our poor immune systems. I have since CAREFULLY washed one of mine (did not even use the 2nd one) .. let it air dry and it is ready for use again.

I have SINCE found it at good old Amazon .. just can't believe it .. you can find ANYTHING at Amazon .. did not even look on Amazon at the time I purchased!! Hope this helps someone! Hugs! Katherine
https://www.amazon.com/gp/product/B01KK2NSVK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=cambridgemask-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B01KK2NSVK&linkId=f4be07a257cb28b462c1db1dc0c037ab