@pweg I never worry about whether I am the only person in a mask, whether it is for air quality or infection reduction. My daughter is a nurse, long Covid sufferer and has severe asthma. Her attitude is now mine. "What I do is for my health. If people ask I will explain, but I really don't care what they think."

My husband, neighbor and I wear masks on poor air quality days to mow and do year work I don't pay too much attention to the AQI - my lungs tell me if it is necessary. We always mask in airports and planes no matter what others are doing. Our Asian neighbors, who have much worse pollution in their countries, often mask in poor air quality - right down to little preschool children.