How many oxygen atoms are in an ozone molecule?
AnswerThree
Ozone is O3, three oxygen atoms.
Science · Facts & stats
Ozone facts & stats
7 fact-checked facts about the ozone layer and atmospheric science, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which chemicals, once common in aerosol sprays and refrigerators, damage the ozone layer?
AnswerCFCs
Chlorofluorocarbons release chlorine that breaks down ozone.
Going deeper
Over which continent was the seasonal ozone hole first reported in 1985?
AnswerAntarctica
British Antarctic Survey scientists reported the hole over Antarctica.
Near the ground, ozone is considered what?
AnswerAn air pollutant in smog
Ground-level ozone is a main part of smog.
World Ozone Day is observed on which date?
AnswerSeptember 16
September 16 marks the signing of the Montreal Protocol in 1987.
Expert level
Which three scientists shared the 1995 Nobel Prize in Chemistry for ozone research?
AnswerCrutzen, Molina and Rowland
Paul Crutzen, Mario Molina and F. Sherwood Rowland won in 1995.
Who discovered and named ozone in 1840?
AnswerChristian Friedrich Schönbein
Schönbein named it from the Greek 'ozein', to smell.
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