He ozone layer is actually repairing itself right now thanks to action by humans and their laws reducing the amount of ozone damaging particles being released in the air. What United States/Global laws helped to reduce the amount of harmful chemicals being released in the air?



No such law is made. This is because the spreading of global awareness make most of the people around the word more loving the environment. Secondly, most of the countries started to manufacturing electronic car or hybrid car, using led instead of tungsten bulb and building more green-energy sources such as solar farm and wind turbine instead of  using nuclear energy, or dam ( Deforestation ) that will pollute the environment.