Question

Photochemical smog always contains ______.

Options

• aluminium ions

• methane

• ozone

• sulphur

Answer 1

Photochemical smog always contains ozone.

Explanation:

Photochemical smog is primarily formed by the reaction of nitrogen oxides and hydrocarbons in the presence of sunlight, producing secondary pollutants such as ozone (O₃), peroxyacetyl nitrate (PAN), and other oxidizing compounds. Ozone is a key component of photochemical smog and is always present in it, contributing to its harmful oxidative effects on living organisms and materials.