Unprecedented ozone levels have made Delhi air more toxic: CSE analysis

Ozone was reported as a prominent pollutant in Delhi (contributing to rising air pollution in Delhi).

Ozone

Ozone (composed of three atoms of oxygen) occurs both in the Earth’s upper atmosphere (stratosphere) and at ground level ( troposphere).
It can be good or bad, depending on where it is found:
Good Ozone:
- Ozone occurs naturally in the Earth’s upper atmosphere (Stratosphere) where it forms a protective layer that shields us from the sun’s harmful ultraviolet rays.
- Ozone depleting gases like chlorofluorocarbons (CFCs), HCFCs, halons, destroy this protective shield and cause holes in the ozone.
- India had adopted the Kigali Amendment (aims to phase-down hydrofluorocarbons).
Bad Ozone:
- In the Earth’s lower atmosphere (troposphere) near ground level, ozone is formed when pollutants emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources react chemically in the presence of sunlight.
- Surface level Ozone is a harmful air pollutant.

Impacts of Ozone Pollution

Surface level Ozone causes damage to crops and forests.
Irritation can occur in the respiratory system giving rise to coughs and an uncomfortable sensation in the chest.
Ozone worsens bronchitis, emphysema, asthma, etc and increases the risk and susceptibility to pulmonary inflammation like Chronic Obstructive Pulmonary Disease (COPD).
It may reduce lung function and make breathing difficult.