英文關鍵字
air
asphalt
auto
automobile
background
car
city
co2
cold
combustion
cool
damage
dioxide
dirty
drive
driveway
dust
eco
emission
environment
exhaust
fog
fumes
gas
jam
machine
monoxide
motor
move
pipe
pollution
road
row
rush
smog
smoke
smoking
street
toxic
track
traffic
transport
urban
vehicle