Ozone layer affects the UV levels by blocking it. In the absence of Ozone, more UV will enter.

If ozone was recovered UV levels will go down. UV are the harmful radiation of the sun.

the UV light kills single-celled organisms

Due to the number of different transition states of the excitable electrons: electronic levels, vibrational levels, and rotational levels. Rotational levels are within vibrational levels, which are within electronic levels. This leads to many different transitions of similar energy, which leads to a broad absorption band.

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