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1) You and your office mate share an office that is 40 m3. “Fresh" air is brought into the room from the
outdoors at a flow rate of 40.0 m3 per hour and the excess air from the room is vented to the annosphere.
Assume that the room is perfectly mixed such that the pollutant concentration is uniform through the
room at all times. Also assume that the pollutant concentrations in the “fresh" air entering the room
contain: 1) 350 ppm carbon dioxide (C02)
2) 5 ppm carbon monoxide (CO) 3) 15 ug m'3 of particulate matter If the average human produces 02 liters per minute of C02 due to respiration and effectively no
particulate mass and carbon monoxide, then calculate the average (steady state) C02, CO, and particulate
matter concentrations in the room while you and you office mate are working in the office. Assume that
there are no other sources of pollutants in the room and no other removal processes.

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volume of 4100 m = 40m3
inflow = 40 ( 3 / ha
Pollutant concentration
1 Co. = 350 ppm = 350mg/8 - 350x10+ 3 ng /m
( since 1pPM = Img/8 18 = 10- 3 mm ? )
CO = 5 PPM = 5mg/8 = 5x10# 3mg/m?

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