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A baseline or follow-up IAQ survey provides measurement information
regarding a number of specific parameters. On the other hand, pre- and post-occupancy evaluations of a building or space are IAQ assessments that “go deeper” than the IAQ surveys. The pre- and post-occupancy evaluations not only measure for specific contaminants but also evaluate the systems and processes that can affect a building’s IAQ. They typically require more time and expense to conduct but provide a far more in-depth evaluation of your building and its systems.
Pre-occupancy evaluations provide information about the building itself prior to occupancy. Post-occupancy evaluations provide information about the actual performance of the building when occupied. EHSI believes that post-occupancy evaluations are critical because people and what they do in a building
significantly impact the air quality within the building. The IAQ during actual performance of a building during occupancy may be very different than the IAQ presumed or targeted during the design of a building.
A recent post-occupancy evaluation conducted by EHSI/Healthy Buildings in an innovative, naturally ventilated building, provided the client with a lot of useful information, including the fact that occupants need to be trained regarding certain aspects of their mechanical system that they can control. This seems like a small issue, but it provided the occupants with a greater sense of control over their indoor
environment which in turn made them more comfortable in the space.
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