1. Components of Air & Human Impact SVN 3E

2. Our Air:  Nitrogen (N 2 )  Oxygen (O 2 )  Water vapour (H 2 O)  Trace Gases: –Carbon dioxide (CO 2 ) –Methane (CH 4 ) –Nitrous oxide (N 2 O) –Carbon monoxide (CO) –Ozone (O 3 ) –Sulphur dioxide (SO 2 ) 78.1%20.9%0–4%0.04%0.036%0.0002% 0.000 05% 0.000 01% 0.000 002% 0.000 000 02%  Now, let’s make a Pie Graph!

3. Our Air:  Nitrogen: useless as N 2 in the air, but valuable nutrient in the soil  Oxygen: used for cellular respiration (to burn fuel for energy)  Water Vapour: humidity – forms clouds and precipitation  Trace Gases: some are associated with pollution!

4. Human Impact on Our Air:  BRAINSTORM! –What human activities impact our air???  SOURCES OF POLLUTION: –Burning of Fossil Fuels –Industry –Transportation (cars, trucks, planes, etc.) –Energy Production –Heating, etc.

5. Human Impact on Our Air:  Some Impacts / Issues: –Increase CO 2, H 2 O, NH 4 = global warming –Increase SO 2 & O 3 = smog –Increase SO 2 & N 2 O = acid precipitation –Increase in air pollutants affect human health, harm ecosystems, result in extinctions, etc.!!!