The San Joaquin Valley Air Pollution Control District (SJVAPCD) has issued a midnight to midnight ban of wood burning devices, including fireplaces and open fire pits, due to unhealthy levels of particulate matter in the atmosphere and a strong inversion layer.
The ban applies to four counties: Fresno, Kings, Tulare, and the SJV Air Basin portion of Kern.
For more info: Check Before You Burn