"This is the prevailing wind flow in the lower parts of the atmosphere," said Nicco. "You can see it's actually going to get worse as we head into the afternoon hours today and into the evening hours."
WATCH LIVE: Track real-time temps, air quality in Bay Area
The Caldor Fire grew to more than 117,000 acres Tuesday to threaten areas leading up to the South Lake Tahoe Basin, according to Cal Fire.
"The winds - look at them shift," said Nicco. "They're so tricky in the mountains because of the different elevations."
Lake Tahoe's bowl-shaped valley has also helped trap a considerable amount of hazy smoke from dissipating.
"I think there's going to be a lot of smoke stuck in the valleys, which is what is causing such high pollution concentration right now," explained Nicco.
Two upcoming wind events will help provide enough push to clear some of the current smoke away.
Winds will come out of the west on Wednesday evening and blow all of the heaviest and most dangerous smoke through Lake Tahoe, said Nicco. Another wind event during the overnight hours into Thursday will spread the smoke even further east.
"But it's still going to leave plenty of unhealthy air" added Nicco. "It's going to be dangerous the next two days."
You can always track the air quality in every Bay Area neighborhood by clicking here.
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