Salfar daayoksaayidiin (SO₂) gaazii halluu hin qabneedha. Maddoonni gurguddoon ho'isa manaa, oomisha elektirikii fi adeemsa industiriitiif boba'aa salfar of keessaa qabu, kan akka dhagaa boba'aa fi zayitaa, gubuu dabalatu.
EEA: wantoota beekamoo qilleensa faalan · WHO: wantoota qilleensa faalanii fi fayyaa