air
atmosphere
black
boat
burning
chimney
climate
coast
dark
day
dense
diesel
dirty
discharge
discharging
emissions
emitting
engine
environment
exhaust
exhaust pipe
freighter
fuel
fumes
funnel
gas
global
harbor
harbour
marine
merchant
nautical
particles
poison
pollution
power
quality
sea
ship
shipping
smoke
start
tanker
toxic
transport
tug
tugboat
vessel
warming
weather