I developed seasonal allergies relatively late in life. From my late twenties onward, I spent many miserable days in the throes of sneezing, headache, and runny eyes. I tried everything the doctors recommended for relief. About a million different types of medicine, several bouts of allergy vaccinations, and endless testing. But never once did an allergy doctor ask the basic question: What kind of air are you breathing?

Turns out that's everything when you're allergic to pollen, grass, and dust mites! The air. That's what's carrying all this particulate matter, so if your idea of proper ventilation is merely to open a window, you're inviting in your nasal assailants. No wonder my symptoms kept escalating.

For me, the answer was simply to stop breathing air full of everything I'm allergic to while working, sleeping, and generally just being inside. And the way to do that was to clean the air of all those allergens with air purifiers running HEPA-grade filters.

That's it. That was the answer!

After learning this, I outfitted everywhere we live with these machines of purifying wonder: One in the home office, one in the living area, one in the bedroom. All monitored for efficiency using Awair air sensors. Aiming to have the PM2.5 measure read a fat zero whenever possible.

In America, I've used the Alen BreatheSmart series. They're great. And in Europe, I've used the Philips ones. Also good.

It's been over a decade like this now. It's exceptionally rare that I have one of those bad allergy days now. It can still happen, of course — if I spend an entire day outside, breathing in allergens in vast quantities. But as with almost everything, the dose makes the poison. The difference between breathing in some allergens, some of the time, is entirely different from breathing all of it, all of the time.

I think about this often when I see a doctor for something. Here was this entire profession of allergy specialists, and I saw at least a handful of them while I was trying to find a medical solution. None of them even thought about dealing with the environment. The cause of the allergy. Their entire field of view was restricted to dealing with mitigation rather than prevention.

Not every problem, medical or otherwise, has a simple solution. But many problems do, and you have to be careful not to be so smart that you can't see it.