Are you aware that your air ducts can cause you to have dust sensitivity problems? It may come as a surprise however your air ducts can directly cause you to have pollen irritations.
This is because your air ducts if they are not cleaned off enough can harbor all kinds of dirt, germs, and bacteria.
Then your heating and cooling system circulates that same dirt and bacteria around your home and out through your vents into your air. When you breathe in dirty air it can cause sneezing, in allergic reactions to the dust and other things that cause sensitivities from the things in the air. So what do you do to avoid this? The best thing you can do is to have some sort of superb air filter. I would recommend a HEPA filter. A HEPA filter is like your regular heating and a/c filter. A HEPA filter is much better because it is used for venues that need to be kept highly sanitized. This means it is even more effective at catching dirt and debris and then your regular disposable air filter. It was like this by design, with tightly woven air filters and fibers… You can absolutely catch the tiniest pieces of dirt, germs, and bacteria. If you have a HEPA filter in your home, you can be assured that you will have excellent indoor air pollen levels, any indoor pollen irritations that you might have had before, should go away almost instantly.