There may be a natural explanation as to why ozone concentrations in the lower stratosphere has decreased, according to a study of Nasa satellite data.
Ozone is found naturally in the atmosphere and protects us from dangerous radiation.
What is known as the ozone layer is the layer of ozone is at about 10-50 km altitude, which protects us against the harmful UV the radiation.
If the ozone layer is damaged, it can affect our ecosystems negatively, among other things, reducing crop yields and disruptions in the food chain in the sea as a consequence.
Between the years 1998 and 2016 have ozone concentrations in the lower stratosphere from the tropics to the 60:th latitude, declined.
A theory from forskarhåll has been that this is due to the release of klorflorkarboner, among other in the paint.