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Both the pm10 and pm2.5 units refer to what characteristic of atmospheric particles?

Both the pm10 and pm2.5 units refer to what characteristic of atmospheric particles?
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Both the pm10 and pm2.5 units refer to what characteristic of atmospheric particles?

User Jseabold
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PM₂.₅ and PM₁₀ indicate the diameter of the particles as being less than 2.5μm and 10μm respectively. This size range of particles is considered inhalable.
User Adwaenyth
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