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  1. The Hazardous Effects of Air Pollution on People Around the World, Part 1 of 2

    The Hazardous Effects of Air Pollution on People Around the World, Part 1 of 2

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  2. Pollution is the process of making soil, water, air or other parts of the environment dirty.

    Pollution is the process of making soil, water, air or other parts of the environment dirty.

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  3. The Unexpected Way This City's Air Becomes Toxic

    The Unexpected Way This City's Air Becomes Toxic

    12
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