Is the Heavy Air of Winter the Reason We have More Colds and Flues?

   The mystery of why colds and flues come to a halt in winter might be that the germs float in the air better during the winter months.

   If it is warm, the air expands, making it lighter so things float in it better. So, when a germ flies out of your mouth in summer, it is heavier than the air, so it falls to the ground quicker. In winter, though, it hangs and hangs in the air -- right at the level of our breathing.

   A germ on the ground is no harm to a clown, but one at nose level should not be laughed at. 

   I read a lot of reasons why flu rules in winter but loses its reign in summer. 

   People spend more time indoors with each other in winter.

   Our nasal passages are drier, due to drier air, so that allows bacteria to take hold more easily. 

   Viruses replicate better at temperatures just below our body temperature, at least according to preliminary testing on mice. 

    I am not a scientist. So, I might be wrong that air is heavier in winter and lighter in summer. If so, there goes my whole theory. Still, I have been able to study enough to realize a lot of flu transmission comes from breathing in bacteria that hangs in the air, right at face level. If so much of the transmission is due to that, then it follows that if transmissions go down in summer, it might be because the germs are not hanging at face level as much.