two industrial pipes with smoke against blue sky. Air polution (polutant).
Palabras clave
industry,
industrial,
construction,
pipeline,
metal,
pipe,
chemical,
gas,
water,
equipment,
engineering,
gasoline,
oil,
plant,
power,
steel,
technology,
plumbing,
tube,
valva,
energy,
environment,
factory,
fuel,
petrochemical,
pipe,
refinery,
storage,
toxic,
steam,
distillery,
radiator,
hard hat,
indoor,
machinery,
men at work,
electric,
pollution,
natural,
joint,
furnace,
crude oil,
2,
background,
wall,
part,
supply
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