Made dirty or impure with harmful substances like chemicals, waste, or particles.
From Latin 'pollutus,' past participle of 'polluere,' meaning 'to soil or defile.' Originally meant morally unclean, then evolved to mean physically contaminated.
Air pollution kills more people annually than smoking—about 7 million deaths per year—yet it's often invisible, which is why many cities now have air quality apps that show pollution in real-time!
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