Discussion
An aerosol having dry aerodynamic diameter of 3.8 µm falls in the :
Answer: C
A 3.8 µm particle falls in the coarse mode.
Atmospheric aerosols fall into modes by size. The nucleation (Aitken) range covers freshly formed particles below about 0.1 µm. The accumulation mode runs from about 0.1 to 2 µm. Particles above about 2 to 2.5 µm, such as soil dust, sea salt and pollen, make up the coarse mode; this boundary is why PM2.5 is used for fine particles.
Aitken and nucleation are the names for the smallest particles, which are around a thousand times smaller than 3.8 µm. A particle has one size, so it cannot be in all the modes at once.
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