I have noticed for many years that I have become quite sensitive to air quality. I live in the Midwestern US and if you haven't heard we are in the middle of fighting the worst wildfires in the state's history. The air quality has been horrible exacerbating my respiratory symptoms. If you have a sensitivity like this there is an excellent phone app that will monitor the air quality around wherever you live. Just go search for the app BREEZOMETER and download it. It was invented by the Israelis and/or Chinese I believe to monitor their horrible air quality around their bigger cities. It is free and works great. Give it a try. I bet you will like it! It keeps me from going out into horrible air quality, which has been almost every day lately!