atom
atomic
background
barrel
business
caution
chemical
container
contaminated
contamination
danger
disaster
disposal
drum
ecology
energy
environment
fuel
gallon
garbage
green
hazard
hazardous
icon
illustration
industrial
industry
isolated
material
metal
nuclear
object
oil
poison
pollution
power
radiation
radioactive
radioactivity
safety
sign
simple
storage
substance
symbol
toxic
uranium
waste
white