英文關鍵字
pollution
smoke
environment
dust
health
smog
air
asia
mask
protection
person
toxic
unhealthy
urban
asian
city
problem
climate
bad
danger
concept
background
gas
global
protect
sick
dangerous
haze
dirty
face
outdoor
disease
environmental
factory
hazard
medical
mouth
safety
serious
trouble
warming
warning
wearing
china
mist
business
care
change
farmers
burning
grass
leaves
branches
causing
cause
situation
pm2
farmer
5