this ppt is about significance of ozozne in the atmosphere

1. EGEE 102 – Energy Conservation
And Environmental Protection
Ozone and Environment

2. EGEE 102 - Pisupati 2

3. EGEE 102 - Pisupati 3
Ozone
• O3
• a gas composed of three atoms of
oxygen
• bluish gas that is harmful to breathe
• Nearly 90% of the Earth's ozone is in
the stratosphere and is referred to as
the ozone layer
• Ozone absorbs a band of ultraviolet
radiation called UVB

4. EGEE 102 - Pisupati 4

5. EGEE 102 - Pisupati 5

6. EGEE 102 - Pisupati 6
Ozone-Depleting
Substance(s) (ODS):
• CFCs,
• HCFCs,
• halons,
• methyl bromide,
• carbon tetrachloride, and
• methyl chloroform.

7. EGEE 102 - Pisupati 7
Various sources

8. EGEE 102 - Pisupati 8
Effects of OLD
• -- Skin Cancer (melanoma and
nonmelanoma)
-- Premature aging of the skin and other
skin problems
-- Cataracts and other eye damage
-- Immune system suppression

9. EGEE 102 - Pisupati 9
The Antarctic Ozone
Hole
• The ozone hole is
defined as the area
having less than 220
dobson units (DU) of
ozone in the
overhead column
(i.e., between the
ground and space).
Source: http://jwocky.gsfc.nasa.gov/multi/recent_ozone91200.gif

10. EGEE 102 - Pisupati 10
http://www.cpc.ncep.noaa.gov/products/stratosphere/sbuv2to/ozone_hole_plot.gif

11. EGEE 102 - Pisupati 11
Actions
• http://www.epa.gov/ozone/title6/phaseo
ut/22phaseout.html

12. EGEE 102 - Pisupati 12
What can we do?
• Make sure that technicians working on your
car air conditioner, home air conditioner, or
refrigerator are certified by an EPA approved
program to recover the refrigerant (this is
required by law).
• Have your car and home air conditioner units
and refrigerator checked for leaks. When
possible, repair leaky air conditioning units
before refilling them.

13. EGEE 102 - Pisupati 13
What can we do?
• Contact local authorities to properly dispose
of refrigeration or air conditioning equipment.
• Protect yourself against sunburn. Minimize
sun exposure during midday hours (10 am to
4 pm). Wear sunglasses, a hat with a wide
brim, and protective clothing with a tight
weave. Use a broad spectrum sunscreen with
a sun protection factor (SPF)

14. EGEE 102 - Pisupati 14

15. EGEE 102 - Pisupati 15
Ground level Ozone
Formation
• Secondary Pollutant
• VOCs+ NOx  Ozone
• In presence of sunlight
• Ozone + NOX + HCs  Smog (haze)

16. EGEE 102 - Pisupati 16
Photochemical Smog
NO
CO, RH
NO2
CO
HC
O3
CO
PAN
Haze
6:00AM 12NOON 3:00 PM

17. EGEE 102 - Pisupati 17
Smog Sources
Source: http://www.epa.gov/oar/oaqps/regusmog/smog.html

18. EGEE 102 - Pisupati 18
Sources of Volatile
Organic Carbons

19. EGEE 102 - Pisupati 19
Sources of NOx

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What can We do?
• Keep your automobile well tuned and
maintained.
• Carpool, use mass transit, walk, bicycle,
and/or reduce driving, especially on hot
summer days.
• Be careful not to spill gasoline when filling up
your car or gasoline-powered lawn and
garden equipment. During the summer, fill
your gas tank during the cooler evening
hours.

21. EGEE 102 - Pisupati 21
What can we do?
• Make sure your car's tires are properly
inflated and your wheels are aligned.
• Participate in your local utility's energy
conservation programs.
• Seal containers of household cleaners,
workshop chemicals and solvents, and
garden chemicals to prevent VOC from
evaporating into the air. Dispose of them
properly.