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Wildfires to the north bring smoke and hazy skies to Southern California - OCRegister

The hazy skies seen Thursday afternoon across much of Southern California are due to shifting wind patterns and wildfires in Northern and Central California, officials said.

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There are a number of fires burning in Northern California, including the Fawn fire near Lake Shasta and the KNP Complex fire in Sequoia National Park. That park has also seen a second blaze, called the Windy fire. Cal Fire has said that 9,300 personnel remain assigned to 10 active large wildfires.

According to the Air Quality Management District, the current air quality is good in most places, moderate in several Los Angeles areas. The National Weather Service has reported the smoke will linger over the next few days and people should limit their outdoor activities.

According to readings taken around 12:45 p.m. Thursday, Sept. 23, 2021, air quality is good to moderate across Southern California. (Image from AQMD map)

The smoke drifted to Southern California due to a shift in wind patterns that brought breezes from the north, said Mark Moede, meteorologist with the National Weather Service office in San Diego.

Moede and Kristen Stewart, a meteorologist with the NWS’ Los Angeles office, project that the smoke will begin gradually thinning on Friday and continue through the weekend until Sunday.

An uncharacteristic stalled upper level low pressure system over northern Baja California will create winds from the east that will contribute to the thinning, Moede said. A westward sea breeze will also contribute to this as well, Stewart said.

The smoke was situated about 10,000 feet in the atmosphere and may have actually contributed to some cooler temperatures throughout Southern California on Thursday, Stewart said.

However, despite the smoke’s high elevation, some of it could possibly be banked along parts of the San Gabriel Mountains, Stewart said. Elevated air quality index levels were expected in mountain areas Thursday afternoon through Friday afternoon, according to the South Coast Air Quality Management District.

The Air Quality Management District encouraged residents to close all windows and doors and run air conditioning or an air purifier to keep air clean during poor air quality periods. They advised against using house fans or swamp coolers that bring in outside air.

They also suggested avoiding burning wood fireplaces and firepits and minimizing sources of indoor air pollution like candles, incense, pan-frying, and grilling.

Staff writer Quinn Wilson contributed to this report.

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Wildfires to the north bring smoke and hazy skies to Southern California - OCRegister
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