Explanation:

Ozone occurs in two layers of the atmosphere. The layer closest to the Earth’s surface is the troposphere. Here, ground-level or “bad” ozone is an air pollutant that is harmful to breathe and it damages crops, trees and other vegetation.
Ozone is produced naturally in the stratosphere. But this “good” ozone is gradually being destroyed by man-made chemicals referred to as ozone-depleting substances (ODS).
Ozone is not directly emitted by any source but is formed by photochemical reactions between oxides of nitrogen (NOx), other volatile organic compounds (VOCs) and gases in the air under the influence of sunlight and heat.
Air Quality Index (AQI) tracks five major air pollutants: Ground level ozone, Carbon monoxide, Sulfur dioxide, Nitrogen dioxide, Airborne particles, or aerosols. Hence only option 2nd is correct.