Question

why is the HO radical such an important component of the atmosphere

Answer 1

The troposphere, the part of the earth's atmosphere which is closest to the surface, harbors important life processes. This important part of our environment contains primarily nitrogen and oxygen. In addition, it comprises a number of other substances, which are generally present in low concentrations. The primary reason for the low content of these trace components is the activity of a diatomic radical, namely the hydroxyl radical. OH is the main constituent of the oxidizing potential of the troposphere and causes the transformation of many trace components into water-soluble forms, which can then rain out and be removed from the troposphere.

The hydroxyl radical is often referred to as the "detergent" of the troposphere because it reacts with many pollutants, decomposing them through "cracking", often acting as the first step to their removal.It also has an important role in eliminating some greenhouse gases like methane and ozone.