Conditions Saturday night will be favorable for fog development, namely light winds under a clear sky. The rapid cooling near the ground will lead to a weather phenomenon known as a temperature inversion, where the air gets warmer the higher you go in the atmosphere. This is the opposite of what normally occurs in the atmosphere.
Temperature inversions make the air stable and keep pollutants and other particles trapped near the ground. They can also lead to fog formation. Given the large number of fireworks that will be set off Saturday night, it could lead to a smoggy situation. Whenever smoke combines with fog, visibilities can drop to near zero.
Something similar happened just four years ago on New Year's Day in 2019, leading to several car accidents and many stranded New Year's revelers.
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Herzog doesn't think it will be as extreme this time around because of a slight southerly breeze that will be with us through the night. Even if it doesn't get as bad as the 2019 New Year's smog, have your guard up just in case you come across a thick patch of smog while celebrating the New Year Saturday night and Sunday morning.
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