Final answer:
Indoor air pollution is a major concern in developed countries, with sources including biological contaminants, burning of fuels, and building materials. In less industrialized nations, indoor pollution is primarily caused by the use of cheaper fuel sources. Indoor air pollution can have serious health effects on individuals.
Step-by-step explanation:
Indoor air pollution is a major concern in developed countries, as most people spend a significant amount of time indoors. There are many sources of indoor air pollution, including biological contaminants such as bacteria, molds, and pollen; the burning of fuels and environmental tobacco smoke; building materials and furnishings; household products; central heating and cooling systems; and outdoor sources. Other sources of indoor air pollution include radon gas, carbon monoxide, and volatile organic compounds (VOCs). In less industrialized nations, indoor pollution is primarily caused by the use of cheaper fuel sources and a lack of proper ventilation. Overall, indoor air pollution can have serious health effects on individuals.