Question

In terms of particles, why the smell from a farmer spreading manure on his fields can be smelt from some distance?

Answer 1

The closed period prohibits organic manures, including slurry, poultry litter, sewage sludge and abattoir waste, from being spread from 15 October to 31 January. Farmyard manure must not be applied from midnight 31 October to 31 January.

Answer 2

Because the particles in air containing smell of the manure collide with each other. They move through diffusion and reached to the area of lower concentration at some distance.