Breakdown of osen wo heraseba, tikyuu no kuuki ga kirei ni narimasu.
をwo
direct object particle
がga
subject particle
のno
possessive case particle
なるnaru
to become
〜ば〜ba
conditional form
きれい にkirei ni
cleanly
空気kuuki
air
地球tikyuu
Earth
汚染osen
pollution
減すherasu
to reduce
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