Which one of the following is used to measure ozone level in the atmosphere?

general knowledge science & technology

  1. By the number of ozone atoms in an atmospheric column, called Chapman unit

  2. By expressing the columnar density of Ozone in Dobson unit (thickness of ozone in an atmospheric column under standard temperature and pressure)

  3. By measuring the ultraviolet radiation level in the ground

  4. By measuring the Oxygen level in the Stratosphere

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Correct Option: B

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