air

atmosphere

chimney

climate

cloud

coal

complex

critical

damage

danger

dangerous

dirty

ecology

emission

emit

energy

environment

environmental

exhaust

factory

global

heavy

industrial

industry

infrastructure

landscape

man

manufacturing

ozone

person

pipe

plant

poison

pollute

polluting

pollution

power

powerplant

problem

produce

production

smog

smoke

smokestack

station

steam

structure

technology

toxic

urban