human
I've heard that the ozone hole is growing. Is that true?
assistant
Yes, it's true. The ozone layer is a thin layer of gas in the stratosphere that absorbs ultraviolet radiation from the sun. Over time, the ozone layer has been depleted due to human activities such as air pollution and aerosol emissions. This has led to an increase in UV-B radiation reaching the Earth's surface, which can cause skin cancer and other health problems.