If you work with pastels you should take into consideration to wear a mask to protect your lungs.There are various models available at the hardware store but I always had the feeling that I couldn’t breath so well. A couple of years ago I found an excellent alternative from the company Totobobo . It was originally invented to help you protect against air pollution in Asia but you can use it against pastel dust as well.
These are the pads after a week of use, even though I have additional air cleaner in my studio.
Meanwhile you are able to purchase them worldwide. Find a distributer here.