Photochemical smog is formed through the chemical reactions involving sunlight, nitrogen oxides and hydrocarbons. It is different from London-type smog which is primarily caused by industrial emissions. It is also not limited to a particular season and can occur throughout the year. Lastly, photochemical smog became more prevalent in the 1900s with the increase in automobile use and industrialization.

Solved

Photochemical Smog

Question 11

Multiple Choice

Photochemical smog:

A) is sometimes called London-type smog.
B) is generally worse during the winter months.
C) is formed from chemical reactions involving sunlight, nitrogen oxides and hydrocarbons.
D) is caused primarily by industrial emissions.
E) was more prevalent in the 1800s than the 1900s.

Correct Answer: