When Buildings Talk, We Listen.

Carbon Dioxide

The assessment include real-times measurement for carbon dioxide. Carbon dioxide is a normal metabolic by-product of human respiration and has become a recognized standard indicator for IAQ. Elevated carbon dioxide (CO2) concentration can be an indication of excessive building occupant load, poor air circulation, or limited fresh air intake and mixing.  ASHRAE recommends that indoor CO2 levels not exceed 700 ppm above outdoor levels. 

Carbon Monoxide

Carbon monoxide (CO) is a byproduct of combustion.  CO can be a concern in indoor environments where poorly ventilated appliances are present or where outdoor air intakes are located in areas subject to high concentrations of vehicle exhaust.  CO is also present in significant quantities in tobacco smoke and can be present in detectable concentrations inside buildings where smoking areas are located an insufficient distance from building entrances.  OSHA has established a permissible exposure limit for CO of 50 ppm as an 8-hour time-weighted average.  Lower concentrations of CO, if present, can be cause for concern and should be evaluated further to determine possible source(s).