The criteria are based on a meteorological value called 500-millibar (mb) heights.
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Placer County is divided among three different air basins, Sacramento Valley, Mountain Counties, and Lake Tahoe. The California Air Resources Board (ARB), uses specific criteria (California Code of Regulations-Title 17) to determine the burn day decisions. The Placer County Air Pollution Control District provides this information, on permissive burn days, to the public each day by 8 a.m.
Rainy days are usually associated with lower 500-millibar heights. Good smoke dispersion with smoke rising upward. Rain-washes smoke particles out of the air.
Burning is allowed only on a permissive burn day and in those areas of Placer County that allow burning.
On days when the fire danger is increased, the Air District works very closely with local fire officials to include their information in the burn day message. For more information, contact the Placer County Air Pollution Control District at 530-745-2330.