1. Unit 7 Maintaining Air Quality
Determine major sources of air pollution and identify procedures for maintaining and improving air quality.
Unit text is not visible.

2. Introduction
Air: colorless, odorless, tasteless gas mixture (~78% N, 21% O, and 1% mixture of Ar, CO2, Ne, He, and other gases)
Water: clear, colorless, tasteless, nearly odorless liquid (two parts hydrogen to one part oxygen)
Soil: top layer of the Earth’s surface that is suitable for plant life

3. Air Quality Threats to air quality Sulfur Hydrocarbons
Nitrous oxides and lead
Carbon monoxide
Radon

4. Science Connection Environmental success story: Elmhurst Park District
Illinois agency: manages parks and other recreational facilities
“Clean Air Counts” recognition
“Green Team” 1. Assessed environmental needs 2. Developed strategies and policies
Put Elmhurst Park District on separate line; changed parentheses to periods in numbered list

5. Science Connection Natural selection as a result of pollution
Industrial revolution: early 1800s
Coal pollution: darkened tree bark
Dark-winged moths: developed better camouflage to hide from predators
Soot pollution reduction: lighter color moths predominated
Changed wording to “developed better camouflage to hide from predators”
Changed wording to: “lighter color moths predominated”

6. Air Quality (cont’d.) Threats to air quality
Radioactive dust and materials
Chlorofluorocarbons (CFCs)
Particulates
Pesticides
Asbestos

7. Air Quality (cont’d.) Atmospheric effects Thinning ozone layer
Scientists and governments: efforts to improve living conditions without negative impacts on air quality and other environmental factors
Thinning ozone layer
“Hole in the ozone layer”: area over Antarctica
The greenhouse effect
Heat buildup from sun rays passing through clear objects and trapping heat inside

8. Air Quality (cont’d.) The greenhouse effect
Greenhouse gases: carbon dioxide, water vapor, ozone, methane, halocarbons, and nitrous oxide
Ultraviolet rays: damage skin extensively; cause other life-threatening effects
Infrared: emitted from warm objects
Global warming–a topic for scientific debate
Human activities versus long-term climatic cycles
Changed vs. to “versus”

9. Air Quality (cont’d.)
Precautions against global warming: reducing emissions
Carbon dioxide (CO2)
Chlorofluorocarbons (CFCs)
Methane (CH4)
Nitrous oxide (N2O)

10. Science Connection Overcoming the effects of air pollution
U.S. Department of Agriculture (USDA) scientists
Ozone impacts: lost crop yields
Ethylenediura (EDU) treatment: protecting plants and shade trees
Research focus: reducing the pollutants’ effects on living organisms

11. Air and Living Organisms

12. Air and Living Organisms (cont’d.)

13. Maintaining and Improving Air Quality
Aerosol products containing CFCs: discontinue use
Tightly built, heavily insulated buildings: provide adequate ventilation
Buildings: radon gas checks
Interior areas: exhaust fans to remove cooking oils, odors, solvents, and sprays
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14. Maintaining and Improving Air Quality (cont’d.)
Furnaces, air conditioners, and ventilation systems: regular cleaning and servicing
Sawdust, wood chips, paint spray, welding fumes, and dust-removal systems: routine maintenance
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15. Maintaining and Improving Air Quality (cont’d.)
Gasoline and diesel engines: properly tuned and serviced
Motor vehicle emissions systems: properly placed and serviced
Outdoor burning: observe codes and laws
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16. Maintaining and Improving Air Quality (cont’d.)
Suspicious toxic materials or conditions: report to authorities
Pesticide sprays: reduce use; follow label directions
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17. Hot Topics in Agriscience
Research to improve photosynthesis
Stimulate plant growth through more efficient photosynthesis: interrupt respiration during hours of darkness

18. Maintaining and Improving Air Quality (cont’d.)
Air quality standards
Clean Air Act’s National Ambient Air Quality Standards
Clean Air Act’s New Source Performance Standards
Prevention of Significant Deterioration, Air Guidance Documents: EPA’s Office of Air and Radiation
Updated air quality standards for smog (ozone) and particulate matter
AU: Do you want to switch this with slide 17? This continues the Air Quality subject from slide 16. Moved text down. Moved Air to second line of head.