Following several days of widespread wildfires throughout the region, the Kingsport Fire Marshal lifted the ban on all outdoor burning inside the Kingsport city limits.While burning natural materials such as brush and leaves is allowed in Kingsport, fire officials srtill have the following rules:Burning leaves, branches, tree limbs, twigs, lawn clippings, woody vegetation, yard trimmings, unpainted and uncoated wood and untreated lumber is allowed and those who are burning materials must supervise the flames and keep it from spreading.