Other explanations which need to be explored are: reducing the positive feedback from water vapour; an increase in cloudiness; anthropogenic aerosols; man-made land changes; increasing air traffic; and solar variations including climate.

SOLVE mainly relies on NASA's Stratospheric Aerosol and Gas Experiment (SAGE) III satellite instrument used to measure high-latitude ozone loss.

More aerosols in the atmosphere means that haze and cloud layers become thicker and block the sun's rays, thereby partially offsetting global warming from greenhouse gases.

Iodine vapours condense to form aerosols over oceans and add to the Earth's "heat shield" through the formation of haze and cloud layers.

We must react as quickly as possible, particularly as we know which substances deplete the ozone layer. Firstly, there are the hydrochlorofluorocarbons or HCFCs. These are used mainly in refrigeration technology and air-conditioning systems, as solvents and in the production of insulating foam. Secondly, there is methyl bromide which is primarily used for soil fumigation to combat pests and plant diseases. It is classified by the WHO as “highly toxic”. Thirdly, there are the chlorofluorocarbons or CFCs which are now only contained in refrigeration systems but which were originally used in the production of plastic foam, solvents and aerosol propellants ...[+++].

The Recommendation also contains provision for the labelling of those aerosol cans that will continue to contain CFCs with the label "Contains CFC which damages ozone".