Five people get into a car with an air exchange rate of 4 h-1 and an interior volume of 4 m3 . Assume each person emits 35 g CO2/h. The five people drive for 2 hours total. a. Calculate the CO2 concentration in the car after 15 minutes of driving. b. Calculate the steady-state CO2 concentration. c. How long to get to 95% of steady-state? d. How long to get to 99% of steady-state? Assume that one person smokes a cigarette for the last 10 minutes of the trip. The cigarette steadily emits a total of 5 mg of PM2.5 (total mass of particulate matter less than 2.5 µm in diameter) (ignore deposition). e. What is the final concentration of PM2.5 (in mg/m3 ) at the end of this trip? f. Calculate the intake fraction for PM2.5 associated with the cigarette smoke for the non-smokers over the 10-minute period.

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To solve this problem we will use the mass balance equation for carbon dioxide CO2 and particulate matter PM25 in the cars interior We will also take ... View the full answer