Which of the following pollutant causes aggravation of respiratory disease, and atmospheric discolouration?

Correct option is C

Nitrogen dioxide (NO₂) is a pollutant known for aggravating respiratory conditions such as asthma and bronchitis. It irritates the airways and increases the risk of respiratory infections, especially in individuals with pre-existing respiratory diseases. Additionally, NO₂ is a major contributor to atmospheric discoloration; it creates a brownish hue in the air, especially in urban areas, due to its role in forming photochemical smog.
Information Booster Nitrogen dioxide is primarily produced from vehicle emissions, industrial processes, and power generation. In the atmosphere, NO₂ contributes to the formation of ground-level ozone and particulate matter (PM), both of which are harmful pollutants. NO₂ is also involved in acid rain formation, which has further environmental impacts.
Additional Knowledge · Carbon Monoxide (Option A): Carbon monoxide (CO) is a colorless, odorless gas that primarily affects the cardiovascular system by reducing the oxygen-carrying capacity of blood. While it is toxic, it does not directly cause respiratory issues or atmospheric discoloration.
· Lead (Option B): Lead is a heavy metal pollutant that primarily affects neurological and developmental health. It does not cause respiratory issues or discolor the atmosphere.
· Ozone (Option D): Ground-level ozone is a respiratory irritant that can exacerbate asthma and other lung diseases, but it does not directly cause atmospheric discoloration. However, it contributes to photochemical smog formation in combination with NO₂.