What does the term 'smog' refer to?

The term 'smog' specifically refers to a type of air pollution that commonly accumulates over urban areas, leading to a decrease in visibility. Smog is typically a mixture of smoke, fog, and other pollutants that result from various human activities, such as vehicle emissions, industrial processes, and the burning of fossil fuels. The combination of these elements forms a thick haze that can be particularly prevalent in densely populated areas, especially during certain weather conditions.

Smog also has health implications, as it can contribute to respiratory issues and other health problems in the population exposed to it. This phenomenon is most associated with industrialized cities and is significant in studies related to environmental science and public health, making the understanding of its causes and effects crucial in addressing urban air quality issues.