a family or friends or folks outside of your household. >> joining us now from the l.a. area airport, what are experts saying about masks? does it matter what kind of mask you wear? >> reporter: kate, health experts say any mask is better than no mask but added n95 or doubling up face coverings will provide better protection. >> thank you. health experts are saying to be safe this holiday you should get tested before any gathering preferably the same day. that means finding a covid test but it is a challenge to get one with endless lines at clinics today and home kits sold out in a lot of areas. morgan chesky on what is behind the shortage. >> reporter: tonight from coast to coast, omicron's impact growing by the day. >> very, very scary. i definitely want to get tested more. i had a couple friends test positive. it is not good. >> reporter: the rise in cases exposing a drastic dip in testing