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S-4. In the indoor air of the room described in S-3 above, nitrogen dioxide (NO2) is...

S-4. In the indoor air of the room described in S-3 above, nitrogen dioxide (NO2) is continuously released from a combustion source and destroyed by photochemical reactions, at a constant rate of 40 μg/min. The steady state concentration of NO2 in this room is measured to be 20 μg/m3. Calculate its residence time.

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Residence time - Amount in steady state/ Reservoir flows in or out 20 Ag/m3 Youngmin & min/m3 I Residence time - 0.5 min to p

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