Final answer:
Smog is a harmful mixture of air pollutants resulting from fossil fuel combustion, affecting urban areas' health and visibility.
Explanation:
Smog is a mixture of air pollutants like sulfur dioxide, nitrogen oxides, ozone, and particulates that form over urban areas due to fossil fuel combustion. The term combines 'smoke' and 'fog,' creating a brownish haze harmful to health and visibility.
There are two main types of smog - industrial smog from fossil fuel burning, and photochemical smog formed by reactions between emissions and sunlight. Photochemical smog, occurring mostly in summer, is a significant health concern in urban areas.
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