Work near moving mechanical parts (spinning shafts, engines, lifts, etc.): Never Work in high, precarious places (tall structures, bucket lifts, extension ladders, etc.): Never Fumes or airborne particles (painting, sanding, solvents, flying lint or dust particles, etc.): Never Toxic or caustic chemicals (including potential for chemical spills, etc.): Never Outdoor weather conditions (exposure to outdoor heat, cold or inclement weather): Never Wet or humid conditions (not weather-related, such as greenhouse, carwash, etc.): Never Extreme cold (not weather-related, such as freezer, cold storage, etc.): Never Extreme heat (not weather-related, such as furnace, kitchen, ovens, etc. where temperature is regularly above 100 degrees F): Never Risk of electrical shock (live electrical wires, equipment that retains power after shutoff): Never Work with explosives (TNT, dynamite, nitroglycerine, or other related explosives): Never Risk of radiation (x-ray equipment, nuclear radiation, electromagnetic radiation, etc.): Never Vibration (jackhammer, soil compactor, equipment that creates high vibration, etc.): Never.