1. Air pollution and the ozone hole

2. Ozone Review: answer these questions What is ozone?
What is its chemical formula?
Where is ozone found
Of what importance is ozone?

5. What harms the ozone layer?
CFCs = chlorofluorocarbons
Large, man-made molecules with chlorine in them.
CFCs were used in many aerosols, refrigeration units, air conditioners.
UV radiation knocks the chlorine out of the molecule, where it then is able to react with ozone, destroying it.

6. The ozone hole YouTube - The Earth's Ozone Hole from 1979-2007
During the Antarctic winter, June-August, cold winds circle the Antarctic
Air above Antarctica is very cold then.
Chlorine split off from CFCs. Then, when sunlight returns in September-November, the sun’s rays split chorine molecules into chlorine atoms, which destroy ozone.

7. Impact of ozone hole
Lower ozone allows more UV-B radiation to reach the ground.
This radiation can damage DNA in humans and other organisms.
UV radiation can kill phytoplankton
UV radiation can interfere with photosynthesis

8. Protecting stratospheric ozone
1987 – nations met in Canada and agreed to limit their production of CFCs (Montreal Protocol).

10. Particulate pollution
What is it?
Small particles in the atmosphere
Made of sulfuric and nitric acid, organic chemicals, metals, soil, and dust particles
Two sizes
Larger: 2.5 – 10 micrometers called PM10
Smaller: < 2.5 micrometers called PM2.5

11. Particulate matter
PM10: coarse particles, near roadways and dusty places
PM2.5: emitted by forest fires, cars, or form from gases emitted.

13. Impacts of particulate pollution
Health impacts
Small particles get into the smallest air sacs of the lungs. Can scar them
Environmental impacts
PM2.5 causes haze