Don’t underestimate the negative effects of fire smoke in the air. Last summer, in the midst of the pandemic, my band practiced in my front yard, socially distanced, until the smoke from the Northern California fires forced us to stop. Senior management and I stayed inside with the AC running. We also taped a furnace filter to a box fan and ran it 24/7 in the living room. After only a day, the filter turned brown.
Bill, tgo