Most people are aware that outdoor air pollution is unhealthy, but many do not know that indoor air pollution is more common and very unhealthy.
For classrooms NZ Standard 4303, "Ventilation for Acceptable Indoor Air Quality", calls for 8 litres of fresh air per occupant.
Studies of indoor pollutant levels indicate may be 2-5 times, and occasionally more than 100 times, higher than outdoor levels. Most people spend about 90% of their time indoors.
Acceptable Indoor Air Quality and comfort temperatures require
Temperature and humidity cannot be overlooked because thermal comfort concerns underlie many complaints about "poor air quality", or "stuffiness". Temperature and humidity affect indoor contaminant levels.
For rooms with high density, sustained occupation for cost effective resorts, the subjects of Heating and Ventilation (winter and summer), should be considered as one subject.
Indoor Air Pollution is among the top five environmental risks to public health. Acceptable IAQ is a vital component of a healthy indoor environment, and can help schools reach their primary goal.
Indoor Air Problems do not always produce easily recognised impacts on health, or well-being of occupants. Often, only one or a few individuals may be affected by what appears to be psychosomatic in nature, because other occupants do not appear to have any symptoms.
Children are especially susceptible to air pollution, because the same concentration of pollutants cause higher body burden in children than adults. Children breathe a greater volume of air relative to their body weight than adults. Indoor Air Quality is more than a "quality" issue; it is the safety of students, staff and property that is a major responsibility.
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