In which layer are we noticing the hole in the ozone layer

stratosphere in the atmospheres 5 layers

Explanation:

The Ozone Hole. For nearly a billion years, ozone molecules in the atmosphere have protected life on Earth from the effects of ultraviolet rays.

1) The troposphere is the first layer above the surface and contains  70 to 80 per cent of the Earth's atmosphere. Weather occurs in this layer. 

2) Many jet aircrafts fly in the stratospherebecause it is very stable. Also, the ozone layer absorbs harmful rays from the Sun. 

3) Meteors or rock fragments burn up in the mesosphere. 

4) The thermosphere is a layer with auroras. It is also where the space shuttle orbits. 

5) The atmosphere merges into space in the extremely thin exosphere. This is the upper limit of our atmosphere.