The Montreal Protocol is an agreement between countries to help protect the ozone layer, which is an important part of our atmosphere that helps protect us from the sun's harmful rays. The Montreal Protocol was created in 1987 and sets limits on the production and use of certain gases that harm the ozone layer. Countries that have signed this agreement have agreed to reduce their use of these gases and to help find safer alternatives. By making these changes, the Montreal Protocol helps us all to keep the ozone layer strong.