英文關鍵字
air
building
calamity
chemical
chemistry
city
czech
danger
dirtiness
dust
ecology
electricity
environment
exceeding
factory
fog
health
human
industry
journey
lighting
limits
metal
natural
nitrogen
ostrava
oxides
part
permitted
plant
pollution
power
quick
real
republic
residential
scene
serious
situation
sky
smog
smoke
station
steel
street
structure
sulfur
time
tower
town
traffic
transportation
warming
winter