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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.


  • 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

who was the first nanotechnologist
Lizzy Reply
technologist's thinker father is Richard Feynman but the literature first user scientist Nario Tagunichi.
Norio Taniguchi
I need help
anyone have book of Abdel Salam Hamdy Makhlouf book in pdf Fundamentals of Nanoparticles: Classifications, Synthesis
Naeem Reply
what happen with The nano material on The deep space.?
pedro Reply
It could change the whole space science.
the characteristics of nano materials can be studied by solving which equation?
sibaram Reply
plz answer fast
synthesis of nano materials by chemical reaction taking place in aqueous solvents under high temperature and pressure is call?
hydrothermal synthesis
how can chip be made from sand
Eke Reply
is this allso about nanoscale material
are nano particles real
Missy Reply
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
where is the latest information on a no technology how can I find it
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
has a lot of application modern world
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
STM - Scanning Tunneling Microscope.
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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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