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ozone
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Curved horizon of Earth seen from space with a blue atmospheric layer above white clouds, set against a black sky filled with stars.
New York City skyline tinted orange from wildfire smoke.
Three researchers in winter clothing launch a large transparent balloon carrying an ozonesonde on a snowy field at South Pole Station in Antarctica, with research buildings in the background. Figure 16: Column abundance of O3 as function of latitude and time of year in Dobson units (one Dobson unit defines the content of O3 in a column of one-millimetre length at standard air pressure and temperature). Southern Hemisphere ozone hole Diagram illustrating ozone chemistry in pure oxygen, showing the cyclical reactions between molecular oxygen (O2), atomic oxygen (O), and ozone (O3), with arrows indicating conversion steps and the role of light energy.
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Videos

How Is Air Quality Measured?
Even something as simple as breathing can get complicated.
Video: Encyclopædia Britannica, Inc.

Images

ozone layer
A view of the Earth's ozonosphere, or ozone layer, from space. This region of the...
© Studio023/Dreamstime.com
ozonesonde
Researchers launching a balloon carrying an ozonesonde, an instrument that measures...
NOAA
Figure 16: Column abundance of O3 as function of latitude and time of...
From Atmospheric Ozone 1985, World Meteorological Organization, Report No. 16, (1986), by courtesy of the National Aeronautics and Space Administration
Figure 10: Schematic view of ozone chemistry in a pure oxygen environment.
Encyclopædia Britannica, Inc.

Interactives

Southern Hemisphere ozone hole
Two bar graphs depicting the maximum ozone hole size and the minimum ozone coverage...
Encyclopædia Britannica, Inc.
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