1. Air pollution part 3 Indoor pollution and health effects

2. Indoor air pollution Air pollutants can be 2-100 times more concentrated inside buildings than outside. Top four most dangerous: –Tobacco smoke –Formaldehyde (in building materials, treated furniture and upholstery) –Radioactive radon-222 gas (seeps from underground) –Very small fine and ultrafine particles (circulate in air) World Health Organization: –Connection between poverty and environmental quality –Many people in developing countries burn wood, charcoal, dung, and coal indoors for heating and cooking –Poor ventilation and access to healthcare

3. Chloroform Benzo-  -pyrene Styrene Radon-222 Methylene Chloride Tobacco Smoke Carbon Monoxide Asbestos Nitrogen Oxides 1, 1, 1- Trichloroethane Particulates FormaldehydeTetrachloroethylene Para-dichlorobenzene Fig. 19-11, p. 453 Indoor air pollutants and their sources

4. Living "pollution": dust mites, mold spores, and mildew Household dust mites that feed on human skin and dust, live in materials such as bedding and furniture fabrics. –Can cause asthma attacks and allergic reactions in some people. Molds and mildews are sources of chronic allergies –Can cause headaches and aggravate asthma and other respiratory diseases Figure 19-12

5. Radioactive Radon Radon-222, a radioactive gas found in some soils and rocks Can seep into some houses and increase the risk of lung cancer. Sources and paths of entry for indoor radon-222 gas Sources and paths of entry for indoor radon-222 gas. Figure 19-13

6. Health effects Each year, air pollution prematurely kills about 3 million people, mostly from indoor air pollution in developing countries. In the U.S., the EPA estimates that annual deaths related to indoor and outdoor air pollution range from 150,000 to 350,000. According to the EPA, each year more than 125,000 Americans get cancer from breathing diesel fumes. © WHO Figure 19-16