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pollution | National Geographic Society

https://www.nationalgeographic.org/encyclopedia/pollution/
pollution | National Geographic Society

pollution | Definition, History, Types, & Facts - Encyclopedia ...

https://www.britannica.com/science/pollution-environment
pollution | Definition, History, Types, & Facts - Encyclopedia ...

Air pollution - WHO | World Health Organization

https://www.who.int/health-topics/air-pollution
Air pollution - WHO | World Health Organization
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