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♤ It refers to the physical, chemical, and biological characteristics of air in the indoor environment within a home, or an institution or commercial facility.
♤ Indoor air pollution is a concern where energy efficiency improvements sometimes make houses relatively airtight, reducing ventilation and raising pollutant levels.
♤ Indoor air problems can be subtle and do not always produce easily recognized impacts on health.
♤ Different conditions are responsible for indoor air pollution in the rural areas and the urban areas.