Ozone is a molecule , with a strong smell and it is blue in color and it is about 15 to 30 KM away from the earth. It protect the earth from the ultraviolet rays coming from the sun. The ozone layer has been damaged due to the large amount of carbon dioxide gas is released in earth and the cutting of trees in large amount on earth causes the destruction of ozone layer. We saw the heat stroke in recent 3 to 4 years in many countries and saw how people were died their due to ultraviolet rays of sun .
Treatment of Heat Stroke:
The body must be placed in cool area (e.g shade or room) and removed their clothes to loss the heat quickly from the body.
The person bathed by cool water or put the towel in neck ,head and foot area to loss the heat quickly.
The fan is swing around a person who was affected by heat stroke.
Here is the video link where you can get the idea to prevent from heat stroke: 