aerial

air

atmosphere

building

chemical

chimney

city

cityscape

colorful

construction

cooling

damage

danger

dioxide

dirty

ecology

emissions

energy

environment

environmental

exhaust

factory

fumes

generation

heat

heating

industrial

industry

landmark

manufacture

manufacturing

pipe

pollution

power

problem

production

refinery

sky

smog

smoking

stack

station

steam

structure

technology

tube

urban

view

water

white