Forest fires are a big problem in West Virginia, damaging forests, polluting air and water, and causing erosion. Most fires happen in the southern coalfields, often due to arson or accidents like campfires, power lines, or burning trash. Fires are most common in spring and fall, and burning is only allowed from 4 p.m. to 7 a.m. during those seasons. The state and federal government have worked together since the early 1900s to prevent fires, even using shows and movies to teach people. Smokey Bear became the symbol of fire prevention in 1944. Big fires in 1950, 1952, 1987, and 1991 burned hundreds of thousands of acres. Most fires in West Virginia burn small trees and brush, but they can still kill wildlife, damage timber, and hurt the environment.