The aq-5000 and aq-5001 IAQ Monitors, fromQuest Technologies(Oconomowoc, WI), combine with QuestSuite and Metrosoft software to create a unique, simplified and cost effective method to measure air exchange rate. Using carbon dioxide as a tracer gas, air exchange rate can now be readily determined inclusive of all the supplemental flow pathways, using a single instrument and conducting a single test. At the end of the test the software not only automatically calculates the air exchange rate, but can also demonstrate the relationships that exist between ventilation system cycling and other IAQ parameters such as carbon dioxide, relative humidity, temperature, toxic gases, total VOCs, respirable dusts, sound, heat stress, illumination, radiation, air velocity, formaldehyde, ethylene oxide, ozone and more.