How Do You Measure Residential Ventilation?

How do i know how much fresh air, or new air, is being delivered to the master bedrooms? Because it may be some sort of weird percentage. William shercliff wrote a very resting book in 19 81 about heat exchanges. He has some interesting formulas and calculations on a new air. The point as basically bringing the new air in, distributing it and then pushing the bad r the old air out.