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Hand driers that use air increase "germs" on your skin. Paper towels reduce them.
If there are no paper towels I use toilet paper. Last time I used a public restroom I dried my hands on my pants.
There is a lot of fear-mongering and misinformation about paper towels vs air dryers. Paper towels are marginally more hygienic because air dryers spray the particles off your hand into the air. Neither are a good option if you don’t wash your hands well to begin with.
https://www.theguardian.com/society/2019/apr/25/hand-dryers-paper-towels-hygiene-dyson-airblade
I dont know if this has been definitively proven as last I heard the studies that reflected this were paid for by paper manufacturers.
They tested this on Mythbusters and found air dryers to be unsanitary.
They are unsanitary and don't actually dry your hands, but they save the company money, so they're what we get.
The big-paper-towel psyop
Can also use the paper towel to open the door on your way out.