Question

Identify the pollutants that contribute to the formation of ground-level ozone.

1. Volatile organic compounds (VOCs) are precursors to ozone formation.
2. Carbon monoxide (CO) plays a role in ozone synthesis.
3. Nitrogen oxides (NOx) are essential for ozone formation.
4. Ozone is formed independently of other atmospheric pollutants.

• A. i, iv
• B. i, ii, iii
• C. All
• D. ii, iii

Answer 1

Answer:

B. i, ii, iii

• Ground-level ozone (O3) is a major component of smog.

• It is formed from photochemical reactions with pollutants such as volatile organic compounds, carbon monoxide and nitrogen oxides (NOx) emitted from vehicles, and industry.

• Due to the photochemical nature, the highest levels of ozone are seen during periods of sunny weather.

• ozone can also be generated by household equipment, such as portable air cleaners.

• Exposure to excessive ozone can cause problems like - Breathing, trigger asthma, reduce lung function and lead to lung disease.