Indoor air quality is a continuing concern for building occupants particularly in homes and areas where people work. Modern materials can contribute to higher concentrations of Volatile Organic Compounds while more energy efficient building methods can reduce the amount of natural ventilation encouraging mould and mildew, negatively impacting air quality.

BCA Requirements
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Volatile Organic Compounds (VOCs)
VOCs are a group of carbon-based chemicals that easily evaporate at room temperature. Many common household materials and products, such as paints and cleaning products, carpet and interior furnishing can give off VOCs. Common VOCs include acetone, benzene, ethylene glycol, formaldehyde, methylene chloride, perchloroethylene, toluene and xylene.
Different VOCs have different health effects, and range from those that are highly toxic to those with no known health effect. Breathing low levels of VOCs for long periods of time may increase some people’s risk of health problems. Several studies suggest that exposure to VOCs may make symptoms worse in people who have asthma or are particularly sensitive to chemicals. VOCs particularly affect indoor air quality - concentrations of many VOCs are consistently higher indoors (up to 10 times higher) than outdoors.




