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    Please annotate the 3 following sources for a paper on the causes, effects, and solutions to air pollution:

    1) https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0216550
    2) https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0194364
    3) https://www.atsjournals.org/doi/full/10.1164/ajrccm.162.supplement_1.maic-12

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