environmental
abstract
accident
asphalt
chemical
colour
colourful
danger
dirty
disaster
ecology
fluid
fuel
gasoline
global
grunge
industrial
industry
iridescent
leak
leaking
liquid
oil
petrol
petroleum
pollution
purple
rainbow
reflection
shiny
sidewalk
slick
spill
splash
spot
stain
surface
tarmac
textured
transportation
violet
warning
waste
watercolor
way
wet