human
I've heard that the ozone hole is growing. What does that mean, and how can I help prevent it?
assistant
The ozone layer is a protective shield that helps to filter out harmful ultraviolet radiation from the sun. Ozone depletion occurs when certain chemicals called chlorofluorocarbons (CFCs) are released into the atmosphere. These chemicals are used in aerosol cans, refrigerators, air conditioners, and other products. When these CFCs are released into the atmosphere they break down into chlorine and bromine atoms which then react with oxygen molecules to form ozone. This process reduces the amount of ozone in the atmosphere, making it more susceptible to UV radiation and allowing it to be broken down faster.