Question

how does the ozone layer help maintain ground - level air quality?

Explanation:

The ozone layer in the stratosphere absorbs most of the Sun's harmful ultraviolet (UV) radiation. By doing so, it prevents excessive UV - rays from reaching the Earth's surface. High levels of UV radiation can cause chemical reactions in the lower atmosphere that lead to the formation of ground - level ozone (a pollutant) and other air pollutants. So, by reducing UV radiation reaching the ground, the ozone layer helps maintain ground - level air quality.

Answer:

The ozone layer in the stratosphere absorbs harmful UV radiation, reducing chemical reactions in the lower atmosphere that could produce ground - level pollutants, thus maintaining ground - level air quality.