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Indoor CO2 concentrations exceeded the ASHRAE standard due to overcrowded classrooms and inadequate ventilation. Implementation of more breaks and recesses between classes might alleviate the high level of CO2. The occupancy of classrooms in Hong Kong often exceeded the maximum occupancy of the ASHRAE 62-1989 standard. Decreasing the number of students in each classroom can also lower the CO2 level. Increase the rate of ventilation could remove the accumulated CO2; for example, the use of ceiling fans, exhaust fans could increase the exchange of indoor air with the outdoor.
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Australian marine biologist Lloyd Godson lived for two weeks inside the world’s first self-sufficient, self-sustaining underwater habitat BioSUB. He breathed air from microalgae that gave off oxygen through a gas-exchange Biocoil, watered with recycled urine.