A system, method, and apparatus for gas exposure monitoring of a work area are described. The lever doesn’t trap heat and perspiration as will the boot or shell, particularly since these must be lined with heavy padding to provide a modicum of comfort. In the light emitting element, an organic layer, a light emitting layer, and a second electrode are sequentially formed over a first electrode, and the transistor is electrically connected to the light emitting element through a wiring. The suction unit includes a suction duct having one end connected to the dust collector and the other end connected to a vacuum source.