Aha Trivia Stuff Everyone Should Know
Aha Trivia: Stuff Everyone Should Know · ahatrivia.com/mb-wildland-fire-d011e55b2038

What fine particle size in smoke is a major health concern?

PM2.5 and smaller.

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  1. PM2.5 and smaller ✔
  2. Gravel-sized ash
  3. Tree branches

Why: Fine particles 2.5 micrometers or smaller are the main health threat.

Huh, didn't know that: Fine particles 2.5 micrometers or smaller are the main health threat.

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Tiny particles, big concern!
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References

Answer: PM2.5 and smaller. Fine particles 2.5 micrometers or smaller are the main health threat.

  1. Wildfire en.wikipedia.org/wiki/Wildfire
    fine particulate matter, particularly 2.5 μm in diameter and smaller, have been identified as the major health threats
    Checked 2026-11-07.

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