environmental
air
asthma
atmosphere
breathless
carbon dioxcide
chimney
climate
cloud
coal
contaminate
contamination
damage
dirty
ecology
ecosystem
energy
environment
exhaust
factory
global warming
green
harmful
hazard
hazardous
high
illness
industrial
industry
manufacturing
mill
negative
noxious
oil
ozone
palm oil
poison
pollution
power
power plant
sky
smog
smoke
smokestack
sunrise
sunset
toxic
unhealthy
unsafe
unsaved