<s>[INST] I have been diagnosed with hyper-reactive airway & chemical bronchitis. I recently attended an office with an airborne irritant which caused my lips to burn, then my cheeks & eyes felt warm then burning, then voice changed, airway tightned. I went to freshaire, used hfa, symptoms lessened but lasted for 3 days. Can you recommend a kind of a face mask I can use that can eliminate all my exposure while using an O2 canula? [/INST] Thanks for your question on Chat Doctor. In my opinion you should use N 95 masks. This mask is specifically designed for prevention of swine flu. And it is having very good filters which acts as barrier for most of the organism and dust, fume particles. And it is easy to use, very light weight and make up of soft material. So good for facial skin too. And you can also use nasal cannula for oxygen with this N 95 masks. </s>