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air-conditioner. you don't want the air coming in. i talk about asthmatics now over and over, but people can have underlying tendency to have reaction. they can have allergies. you could have an allergy to what's in the smoke, to that particulate matter. you don't want to learn about that by exposure. you want to stay away as much as possible. >> john: doc, we were talking about masks earlier, and you suggested n-95 may have some effect, it's only 2.5 microns, which is teeny tiny teeny, but could it be the case that if you are outside and all you have an got is a cloth mask or maybe one of the procedural masks in your purse or pocket, is something better than nothing? >> i think something is better than nothing, john. i would always encourage that. but you have to understand, and you were very clear, both were very clear on the size of the particles. they are so small that they can get through that basic cloth