“Ozone protects us in the stratosphere but is a pollutant in the troposphere” true or false?

I would say the answer is FALSE because the ozone layer is the common term for the high concentration of ozone that is found in the stratosphere between 15 and 30km above the earth's surface. It covers the entire planet and protects life on earth by absorbing harmful ultraviolet-B (UV-B) radiation from the sun. So if the ozone layer is located at the stratosphere then the answer to your question is FALSE. Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth's surface (see the figure below). Ozone is a molecule that contains three oxygen atoms. At any given time, ozone molecules are constantly formed and destroyed in the stratosphere.

Hope this helps, stay safe and have a great day! :

the answer is either b or c