My advice is to wear a face mask anytime you're cleaning or stirring up the litter. I have COPD, and the last time I cleaned out the barn AND the chicken house, all in one day, I wound up with, according to Urgent Care, pneumonia. Took me 3 weeks to get over that. They told me to ALWAYS wear a face mask when cleaning the animal houses. Call me stupid....I cleaned out the barn and chicken coop yesterday, no mask...going to Urgent Care in a little while....