How are ultraviolet rays used to purify the air?

UV rays create chemical reactions with the oxygen in the air and the chemical compounds (pollutants) in the air to create save “Breathable” elements such as, carbon dioxide and water vapor. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.