Case Study: Singapore Airlines

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Courtesy of Ellis Environmental Management, Inc.

Ellis was contacted after a client had several complaints from employees related to air quality. Ellis conducted exposure monitoring for CO2 and CO, and also took measurements of temperature and relative humidity. Results of the study showed CO2 and CO to be well under the PEL (Permissible Exposure Level) for those two gases. However, elevated temperatures occurring later in the day appears to have been the cause of the complaints.
 
Carbon dioxide, CO2, is a normal constituent of human breath and is dangerous only in extreme (greater than 5,000 parts per million) concentrations. Outdoor levels of CO2 are normally between 250 and 500 ppm. Indoor levels In excess of 1,000 ppm can indicate problems with a building's ventilation system.
 
Carbon monoxide, CO, a contaminant associated with the combustion of fuel, particularly from gasoline, diesel or propane fueled engines.
 
Temperature and relative humidity, when compared to ASHRAE1 standards, are indicators of the general comfort of an office space.
 
Testing for carbon monoxide, carbon dioxide, temperature and relative humidity was performed using a real-time, recording monitor manufactured by Q-Track®. Q-Track monitors are calibrated at the factory when new, and annually by the vendor, Response Rentals.
 
1American Society of Heating, Refrigeration, and Air-Conditioning Engineers

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