A growing body of scientific evidence indicates that the air within homes and other buildings can be even more polluted than the outdoor air in even the largest and most industrialised cities. In addition, those exposed to indoor air pollutants for the longest periods of time are often those most susceptible to the effects of pollution, such as the young, the elderly, and the chronically ill - especially those suffering from respiratory or cardiovascular disease.
Acceptable indoor air quality (IAQ) is defined by the Standard 62 Ventilation for Acceptable Indoor Air Quality as determined by ASHRAE. Founded in 1894, ASHRAE is an international organisation with over 50,000 members whose mission is to advance heating, ventilation, air conditioning and refrigeration services through research, standards writing, publishing and continuing education.Its definition of acceptable indoor air quality is "air in which there are no known contaminants at harmful concentrations and with which a substantial majority of the people exposed do not express dissatisfaction". Poor IAQ is caused by airborne particulates and gases or vapours which adversely affect occupant health and comfort, the building structure or its furnishings.
Some IAQ problems are so harmful that the entire structure can be defined as a ‘sick building'. Many of the environmental pollutants are new and are the result of changes in HVAC (heating, ventilation and air conditioning) system design and operating practices. Others have existed for years, but health-conscious building occupants are now complaining about them.
Poor IAQ has been shown to result in an increased incidence of illness and absenteeism, reduced productivity, irritability, complaints about building odours and stuffiness, as well as health problems. These may include allergies, coughing, diarrhoea, eye, nose and throat irritation, fatigue, general respiratory problems, headaches, nausea, dizziness, runny nose and skin irritation.
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Source: Marriott.com |
