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    DOH OKs use of necklace air purifier by Jaymalin, Mayen

    Published in Philippine Star (2020)
    Article
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    Combatting air pollutants by Guerrero, Alora Mae U.

    Published in Gadgets (2003)
    Article
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    Biofiltration for air pollution control by Devinny, Joseph S.

    Published 1999
    Book
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    Particulate filtration in nuclear facilities.

    Published 1991
    Book

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