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As we have seen, the ozone layer in the stratosphere is a vital layer of protection for the Earth. This layer that contains most of the atmosphere’s ozone is far above the air that we breathe every day, and even above the altitude where most airplanes fly. However, when ozone forms near the surface in the troposphere, where humans breathe, it is an air pollutant that can harm our lungs and the natural environment. This tropospheric ozone is the same molecule as in the stratosphere. However, in the troposphere, ozone forms in very different ways than in the stratosphere. We’ll learn more about tropospheric ozone and other air pollutants in Lesson Five.

Additional resources

More information about good and bad ozone can be found at http://www.epa.gov/airnow/gooduphigh - a booklet by the EPA called Good Up High, Bad Nearby. Other great resources regarding ozone can be found at:

  1. http://www.epa.gov/ozone/strathome.html.
  2. http://www.windows.ucar.edu/tour/link=/Earth/Atmosphere/ozone_overview.html&edu=mid
  3. http://www.clean-air-kids.org.uk/ozonehole.html
  4. Comic strip from US EPA illustrating the two types of ozone: http://www.epa.gov/ozone/sciencem /missoz/index.html.

Vocabulary

  • ozone
  • ozone layer
  • ultraviolet rays
  • Antarctic ozone hole
  • Chlorofluorocarbons (CFCs)
  • Montreal Protocol
  • Environmental Protection Agency
  • Asthma
  • Cancer
  • Tropospheric ozone
  • Stratospheric ozone

Materials (for a class of 25)

  • Hygrometer (1 per class)
  • Infrared Thermometer (1 per class)
  • Ozone Test Strips (1 per class)
  • Ozone Scanner (1 per class)
  • Wind Vane (1 per class)
  • Thermal Glove (1 per class)
  • Cloud Charts (1 per class)
  • GLOBE Measurement Data Sheets (1 per student)
  • Computer
  • Access to Brainpop.com
  • Projection screen

Step-by-step suggested lesson plan

Instructor Activity Student Activity
Measurements. Take your students outside and conduct the GLOBE protocols. Students should set up the ozone strip, take the air and surface temperature, observe the sky for clouds, and measure humidity and wind direction. Students take measurements and write down their results on their data sheets.
Discussion. Ask students to think of examples of things that are good in one location, but bad somewhere else (e.g., a lion in a zoo, the flame of a candle, etc.). Explain that ozone is a gas that is “Good Up High, Bad Nearby”: up high it shields Earth from radiation, but nearby it is harmful to breathe. (See “Background Information” for details and links to resources). Students participate in brainstorming and answer related questions on p. 1.
Video. “Ozone Layer” on Brainpop.com provides a good overview of stratospheric ozone. Students watch video and answer related questions (p. 2)
Discussion: Go into more detail about “good” stratospheric ozone. Ex: How ozone is formed, where the layer can be found, and how it protects our health from UV rays. Students listen and answer questions: (p. 3)
Visual. Show students a picture of the ozone hole. Explain that the hole occurs over Antarctica each September, and that the Montreal Protocol has banned some of the air pollutants (CFCs) that cause it. Students listen and answer question: (p.3)
Measurements. Take your class outside, and scan the ozone strip. Also, retake the surface and air temperature, and the humidity so that students can take the average of these measurements to supplement their ozone measurements. Students take measurements and write down their results on their data sheets.

Expected outcomes

  1. Students can explain the “dual” nature of ozone – it can act as both a major air pollutant and as a layer of protection for the Earth.
  2. Students can define stratospheric ozone, know how it is formed, and know the causes and effects of ozone depletion.
  3. Students complete Lesson Four Journal Activities.

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
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Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Rice air curriculum. OpenStax CNX. May 09, 2010 Download for free at http://cnx.org/content/col11200/1.1
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