When it's smokey out, why does more smoke get into the house in the mornings and evenings?
The most common issue when you have make up air on a hvac systems is when the kitchen exhaust or bathroom exhaust fans are turned on they usually push 80-1000 cuft and that air is sucked in vis the central heat or air ductwork. If an older home is is pulled in through all kinds of leaky air spaces.
The most noticed time when the bathrooms and kitchen exhaust fans are running pushing house air out and bringing fresh / Smokey air in.