What chemicals make up smog?



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    Smog originally referred to the mixture of smoke and sulfur dioxide, usually from the burning of coal. However, the smog that we typically refer to today is created by sunlight, nitrous oxides (NOx), and volatile organic compounds (VOCs) mixing together to create airborne particulate matter and ground-level ozone. Nitrous oxides and VOCs are both released by cars and trucks as they burn petroleum fuels.

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