Environmental sources of risk include cold (cool rooms, freezers, outdoor cold and wet weather) that lowers body and hand temperature, makes gripping harder, raises grip force from reduced sensitivity or gloves, increases hand-arm vibration risk and brings restrictive heavy clothing; high temperatures and radiant heat in foundries, laundries, bakeries and kitchens that make handling harder through sweat and slipping loads; humid environments from steam cleaning, cooking or weather that wet objects and raise force; wind that increases force and reduces control of large flexible items with sudden gusts; slippery and uneven floors and unsuitable floor coverings such as carpet that raise exertion; obstructions from poor housekeeping that force awkward postures; and low or high lighting, glare or reflection that cause awkward or sustained postures.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.