Air pollution 

Air pollution refers to the presence of harmful substances in the Earth's atmosphere, which can have adverse effects on __________ _______ ____ __________ _____ ___ _________ _____ ________ ___ ______.
_______ __________ __________ ________ ________ ______ _________ ___ _________ ____ _______ ______.
_______ _______ __________ _________ _______.
_________ ____ _______ ______ ______ _______ _________ ____.
______ ________ ______ _______ _________ ____ _______.
_____ ___ ______ ______ ________ ____ ________ _______ _____ ___.
_______ _____ ________ ______ ______ ___ __________ ______ ____.
______ ___ __________ _____ __________.
______ _________ ________ _______ __________ __________ __________.
___ ________ ________ ___ _________ _______ _______ __________ __________ ________ __________.
______ ____ _________ ______ _______ __________ ________ _________ ___.
_______.
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