英文關鍵字
air
atmosphere
auto
breath
car
care
city
co2
concept
damage
defense
diesel
dioxide
dirty
disease
diseases
ecology
emission
emissions
environment
environmental
exhaust
facial
filter
flu
fumes
gas
gasoline
hang
hangs
harmful
health
industry
mask
medical
monoxide
pipe
poison
pollution
prevention
protect
provocation
provoking
respiratory
serious
smog
smoke
surgical
symbol
tailpipe
toxic
transport
vehicle