We've had thick smoke outside our home for several days now due to the fires on the west coast. We're doing what we can to filter the inside air and keep excess outside air from coming in (covered fresh air intakes, the dryer vent, etc).
You usually can't smell any smoke indoors even though it smells awful outside all day. However, every morning and every evening the smoke smell comes in for a few hours. I'm curious what causes it.
My best guess is that the air pressure outside increases during those times and that causes the exchange of air to increase. But that's just a wild guess.
Can anyone shed on light on what's happening?