What is the most common cause of forest fires?

Arson, discarded cigarettes, power-lines arcs, and sparks from equipment are the most common human causes of wildfire ignition. Under the right conditions contact with hot rifle-bullet fragments is possible.The most common human causes of fire ignition are fires, cigarettes released, arcs of energy lines (detected by arc maps) and sparks of equipment. Wild fire ignition is also possible under appropriate conditions.