Most building air monitoring systems only check for Heating and Cooling. So the fans that circulate the air may not move the air in an area of the building for long periods of time if the temperature control does not deem it necessary. When you put a large number of people in a small location such as a board room the air circulating system does not recognize this, an makes no effort to increase...

CETCI IAQ Monitors and Stationary Transmitters will accommodate a Formaldehyde sensor.

From Health Canada "FORMALDEHYDE AND INDOOR AIR"
Published July 2005


Low-molecular weight aldehydes, such as formaldehyde, are reactive, highly flammable compounds. At room temperature, formaldehyde is a reactive gas.

Extensive...