air

architecture

atmosphere

blue

building

chemical

chimney

cityscape

clouds

coal

construction

dirty

ecology

electric

electrical

electricity

energy

environment

environmental

equipment

evening

exhaust

factory

fuel

gas

heavy

industrial

industry

manufacturing

oil

petroleum

pipe

plant

pollution

power

production

sky

smog

smoke

stack

station

steam

steel

supply

technology

tower

toxic

warming