Smells are simple small molecules and compared to them viruses are huge
The smell of banana is in large part [Isoamyl_acetate](https://en.wikipedia.org/wiki/Isoamyl_acetate) ist is 6 carbon atom and 1 oxygen in 2 hydrogens in the end. Let’s overestimate to 9 carbon atoms in a straight line. The covalent radii of carbon are 70 picometers so twice that for each atom so 70*2*9=1290 pm = 1.29 nanometer in length and this is an overestimation. The width is a lot less.
A coronavirus is 125 nm in diameter or 100x larger
You can compare it to sand that can be 2mm in diameter. 100x that is a 20 cm.
So you can compare it to sand versus rock the size of a human head and why one can pass through a metal grate made that stop the other.
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