Which of these buildings is most likely to have indoor air pollution?
a. a school with leaks that allow water and heat to be wasted
b. an office building without carbon monoxide detector
c. a tightly sealed house with and unvented water heater

The question is asking: Which of these buildings is most likely to have indoor air pollution? and we have two scenarios with a problem :
A. a school with leaks that allow water and heat to be wasted
and
C. a tightly sealed house with and unvented water heater". (B is a perfectly good scenario without any pollution. ) In A) the problem is a waste of resources, not pollution, and the answer is C- here, the pollution from the water heater would stay in the house.

Pe.dometer would be the most useful to you for monitoring heart rate.

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