Ozone is a pollutant in the __________, but is beneficial in the __________.Question 20Select one:a.stratosphere; thermosphereb.thermosphere; tropospherec.ionosphere; thermosphered.troposphere; stratosphere

Sure, let's break down the question step by step.

1. Understanding Ozone:

   • Ozone (O₃) is a molecule composed of three oxygen atoms.
   • It exists in different layers of the Earth's atmosphere.

2. Layers of the Atmosphere:

   • Troposphere: The lowest layer of the atmosphere where weather occurs and where we live.
   • Stratosphere: The layer above the troposphere, which contains the ozone layer.
   • Thermosphere: A higher layer of the atmosphere, above the mesosphere.
   • Ionosphere: A part of the thermosphere, containing ions and free electrons.

3. Ozone as a Pollutant:

   • In the troposphere, ozone is considered a pollutant. It is a major component of smog and can cause respiratory problems and other health issues.

4. Ozone as Beneficial:

   • In the stratosphere, ozone forms the ozone layer, which is crucial for life on Earth. It absorbs and scatters the majority of the sun's harmful ultraviolet (UV) radiation.

5. Answering the Question:

   • The question asks where ozone is a pollutant and where it is beneficial.
   • Ozone is a pollutant in the troposphere.
   • Ozone is beneficial in the stratosphere.

Therefore, the correct answer is: d. troposphere; stratosphere