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There is no single test to find an indoor air quality (IAQ) problem. Employers should:
Check measurements of temperature, humidity, and air flow.
Inspect and test the heating, ventilation, and air conditioning (HVAC) systems to make sure they are working according to specifications for building use and occupancy.
Perform a building walk-through to check for odors and look for water damage, leaks, dirt, or pest droppings.
Eliminate any leaks and standing water in humidifiers, air conditioning units, on roofs, and in boiler pans. (Standing water can become contaminated with bacteria or fungi.)
Test for radon or for asbestos if required for building occupancy. (In schools, asbestos needs to be checked under the Asbestos Hazard Emergency Response Act or AHERA.)