As I’ve blogged before, ventilation is one of the most important defenses against air that might be contaminated with coronavirus or anything else, and a CO₂ monitor is a good way to check it, wherever you are. I’ve bought several models and have taken them with me into stores, restaurants, gyms, doctors’ offices. (Yes, doctors; all the ophthalmologists I’ve visited have bad ventilation, except at Lahey Health. Pharmacies, and doctors’ offices in hospitals, have all been decent, I’m happy to say!)
