Environment: Requires more than 2/3 of the time working near moving mechanical parts, and being exposed to fumes, airborne particles and outdoor weather conditions; 1/3 to 2/3 of the time in wet or humid conditions, in extreme heat or cold, and exposed to toxic or caustic chemicals; and less than 1/3 of the time in an office setting, in high places, at risk of electrical shock and near vibration. Physical Activity: Requires more than 2/3 of the time standing, walking, using hands and fingers, reaching, climbing, balancing, stooping, kneeling, crouching, crawling, speaking, hearing, tasting or smelling; requires less than 1/3 of the time sitting.