I have regularly been a large fan of HEPA filters, this is because in our experience I have regularly had the most success with them.
If you are having trouble with your indoor air pollen levels, there are many options available on the market for you to try.
I have tried nearly all of them. I have tried UV air filters, however their effect is limited because you cannot see the UV light plus so you never suppose when the bulb is burned out. I have also tried standing media air purification systems plus while they do labor they only labor for 1 room. There are whole home whole-house air purifiers however they are not cheap, they are really costly plus the replacement process for them can be quite long. The HEPA filter is a perfect balance of all these things. This is because of a HEPA filter, almost any dirt or dust particle is going to get caught in the tightly woven fibers that are certainally designed to catch the tiniest particles of dirt plus germs. If you are having any kind of indoor air pollen levels problems I would highly request them, because once you install 1 of your air quality will go back to normal in no time. There have been many people that I recommended for them to get a HEPA filter plus they have told myself and others their personal stories of how a HEPA filter has saved the day for them. They had bad indoor air pollen levels before, however once the filter was installed they saw results plus occasionally as little as a day. They actually are an amazing little tool to use if you are ever in a bad situation with your air quality.