1. Section 2 Air Quality Pages 20-23 https://www.youtube.com/watch?v=U9BA6fFGMjI

2. Air Pollution Pollutants – harmful substances in the air, water, or soil The respiratory system (nose, throat, lungs) is most affected by air pollution. Most air pollution is the result of burning fossil fuels such as coal, oil, gasoline, and diesel fuel.

3. Particles in the Air From Natural Sources evaporation of salt water the wind blows mold and plant pollen forest fires soil erosion dust storms erupting volcanoes

4. Particles in the Air From Human Activities burning fuels such as wood and coal farming and construction release soil particles into the air

5. Photochemical Smog Smog – the brown haze that forms in cities; caused by the action of sunlight on chemicals chemicals + sunlight = smog

6. Acid Rain Rain is naturally slightly acidic, but some contains more acid than normal and is known as acid rain. How does rain become more acidic? 1. Burning coal that contains a lot of nitrogen and sulfur produces nitrogen and sulfur oxides. 2. The oxides combine with water in the air to form nitric and sulfuric acids. 3. Precipitation carries these particles from the air to the surface of our Earth.

8. Improving Air Quality Pollution control devices are required on all cars. Factories and power plants must install filters, called scrubbers, in smokestacks to remove pollutants from smoke.

9. Improving Air Quality With more cars, factories, and other sources of air pollution than ever before, many people think that stricter laws and regulations to control air pollution may be needed. Some people think the stricter laws may not be worth the extra costs. What do you think?

10. Words Worth Knowing Continue your list on ISN #2… pollutants photochemical smog acid rain

11. Questions for you… How can we discover what is in the air in our environment? Think about your home, is there anything that filters air in your home? What particles do you think an air pollution detector might trap?

12. Air Pollution Detector Objective: To make a pollution detector to check for dirt, dust, or other particles that might be in the air in and around school. Supplies 1 sheet of wax paper (approximately 30 cm x 20cm) 1 piece of construction paper String 45 cm in length Hole punch Glue Petroleum jelly (Vasoline)