Open burning, according to the Division of Environmental Quality, occurs when any materials are burned, and air toxins are released directly into the air rather than going through a chimney or a stack. What items a town accepts under its open burn policy varies depending on where you live. Some localities have strict rules about what they accept, while others have more lax rules. In Houston, open burning is defined as any burning that occurs outside of a permitted incinerator. It is open burning if your bonfire, campfire, or other fire is not contained within a barbeque pit, outdoor fireplace, or barbeque grill. According to their city's regulations, open burning is only permitted if the Fire Marshal agrees and gives permission.