Photochemical smog:
a. is sometimes called london-type smog.
b. was more prevalent in the 1800s than the 1900s.
c. is caused primarily by industrial emissions.
d. is formed from chemical reactions involving sunlight, nitrogen oxides and hydrocarbons.
e. is generally worse during the winter months.
Photochemical smog, created by the chemical reaction between sunlight, nitrogen oxides and volatile organic compounds is (e) generally worse during the winter months in part because of the increase in energy used to heat homes and other buildings.
