business
chemical
chimney
cloud
company
construction
dirty
energy
engineer
environment
environmental
equipment
factory
fuel
gas
gasoline
generation
gray
heavy
industrial
industry
lorry
metal
metallic
oil
petrochemical
petrol
petroleum
pipe
pipeline
plant
pollution
power
production
refinery
sky
smog
smoke
stack
station
steel
structure
supply
tank
tanker
technology
tower
toxic
truck
warming