1. Chapter 12-AIR Air, Noise, and Light Pollution

2. Indoor Air Pollution Air quality in buildings can be worse than outside due to substances found in carpet, furniture, paint, etc. Ventilation is key to controlling Sick-building syndrome- Buildings that are securely sealed and harbor mold, fungi, etc. Common in hot or cold areas

3. Indoor Air Pollution Radon gas- Colorless, tasteless, and odorless Produced by decay of Uranium Seeps up through cracks and holes where it adheres to dust Destroys genetic material in lung cells 2 nd -leading cause of lung cancer

4. Indoor Air Pollution Asbestos- Long, thin fibers valued for their strength Used as insulation and fire retardant Banned in early 1970s Cut and scar lungs- Asbestosis Trouble breathing Eventual heart failure

5. Noise Pollution Sound measured in decibels (dB) Intensity-loudness 120 dB causes pain with continuous exposure causing permanent deafness Unneeded noise can cause health problems Loss of hearing High blood pressure Stress

6. Light Pollution No direct hazard to human health Inefficient lighting diminishes view of night sky Inefficient lighting is energy waste Light directed upward is lost into space Downward light is best Energy efficient light includes: Not using when not needed Low pressure sodium sources