英文關鍵字
air
automobile
car
co2
damage
danger
diesel
dioxide
dirty
driving
ecology
emissions
energy
environment
environmental
exhaust
fuels
fumes
gasoline
global
grey
industry
monoxide
motor
motoring
oxides
ozone
petrol
pipe
poison
pollutant
pollute
pollution
running
smog
smoke
sound
toxic
trail
transport
truck
vapor
vehicle