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Smog is a type of air pollution that is characterized by a mixture of various pollutants, including particulate matter, nitrogen oxides, sulfur dioxide, ozone, and volatile organic compounds. The main cause of smog is the burning of fossil fuels, such as coal, oil, and gas, which release pollutants into the air.

Industrial activities, transportation, and energy production are the major contributors to smog. When these sources release pollutants into the air, they can react with sunlight to form ground-level ozone, which is a key component of smog. Additionally, weather conditions such as high temperatures and low wind speeds can worsen smog, as they can trap pollutants close to the ground and prevent them from dispersing.
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