Can cigarette butts be thrown into trash cans in Shenzhen?

Yes. In Shenzhen, it is okay to throw cigarette butts into the trash can after smoking, but you must stub out the cigarette butts, because when the cigarette butts are thrown away, the surface temperature of the cigarette butts can reach 200-300 degrees Celsius, and the core temperature can be as high as 700-800 degrees Celsius. Generally, the ignition point of combustibles is below this temperature. For example, cotton is 150 degrees Celsius and paper is 130 degrees Celsius. The ignition point of most flammable materials in the trash can is lower than the surface temperature of cigarette butts. Therefore, once a cigarette butt is thrown on a combustible material whose ignition point is lower than the surface temperature of the cigarette butt, it is easy to cause a fire.