Question

Which conditions contribute to higher levels of ozone?

1. The highest levels of ozone are observed during sunny weather due to its photochemical nature.
2. Ozone levels are typically highest during cloudy and rainy weather.
3. Cold temperatures and low wind speeds favor the formation of high ozone concentrations.

• A. i only
• B. All
• C. i, iii
• D. iii only

Answer 1

Answer:

A. i only

• 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.