Final answer:
Photochemical smog usually forms in dry, sunny weather due to the reaction of nitrogen oxides and VOCs in the presence of sunlight, predominantly affecting urban environments. Option 2
Step-by-step explanation:
Photochemical smog occurs when nitrogen oxides and volatile organic compounds (VOCs) react in the presence of sunlight, forming a mix of pollutants including ozone.
This reaction is facilitated by a dry, sunny weather climate. Due to industrial activities and motor vehicle emissions, photochemical smog is a significant issue in large, urban areas. Catalytic converters and green chemistry are among the means employed to tackle smog formation.
Understanding the step-by-step process is essential:
Nitrogen burns in the morning, forming nitric oxide (NO).
NO reacts with oxygen to form nitrogen dioxide (NO2).
NO2 absorbs sunlight and breaks down, ultimately leading to the formation of ozone.
Ozone levels are likely to reach unhealthy levels in urban environments during hot, sunny days, but smog can still be problematic during other times and can also affect rural areas through wind transportation. Option 2