燃やす
air
bad
blaze
bonfire
camp
campfire
city
danger
design
dirty
dust
ecology
environment
factory
fire
firewood
flame
flammable
flat
forest
heat
hot
icon
illustration
industry
isolated
leak
light
line
mask
nature
pm 25
poison
pollute
polluted
pollution
problem
set
sign
silhouette
smell
smog
smoke
summer
symbol
wood
world