chemical
construction
dioxide
distillery
energy
engineer
engineering
environment
equipment
factory
factory worker
fuel
fuel storage
fuel tanks
gas
gas industry
gas refinery
global warming
hard hat
industrial
industrial plant
industrial worker
industry
mechanic
metal
oil
oil refinery
oil worker
petrochemical
pipelines
pipes
plant
plant worker
pollution
power
pump
refinery
steel
technology
toxic
toxic substance
worker