Particulate matter (PM₂.₅ and PM₁₀): Tiny solid or liquid particles suspended in air; PM₂.₅ (< 2.5 μm) penetrates deep into lungs and causes serious health effects.
How to apply it: Apply PM₂.₅ to explain why fine particulate pollution is the leading environmental cause of premature death worldwide.
Course: AP Environmental Science · Unit: Atmospheric Pollution
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