Your lungs clear most of what you breathe — but the finest particles, PM2.5, slip past that defense, cross into your bloodstream, and reach your heart and brain. You don't get that exposure back. Here's the honest math for your household — and what fixing it actually costs.
Type your city (or share your location) and we'll pull the latest official reading — then show what it means in the only unit that matters: your life.
Live outdoor data from Open-Meteo (CAMS & official monitoring networks). This is your outdoor air — indoor is usually different, which is exactly why you measure it.
Pick the situation that looks most like your home, then fine-tune. Estimates use the University of Chicago's Air Quality Life Index method.
Some links earn us a commission at no cost to you — it's how the site stays free. We only list gear we'd put in our own rooms.
You breathe ~22,000 times a day — and the dose depends on where you spend the hours. Across an average lifetime:
So the math is simple: fix the air where you actually spend the hours, and you change the dose that counts. Start with the room you're in most.
Pick your situation — get the exact fix, in three budgets. Every pick is chosen for one thing first: dead-simple to install and use.
Exercise isn't optional — it's one of the best things you do for your body. But here's what nobody tells you: a hard workout moves 5-15× more air through your lungs, and you switch from nose- to mouth-breathing — skipping the one filter you were born with. So on a polluted day, the harder you push, the deeper you drive the bad air.
The fix isn't a mask or a gadget on your face (thin evidence). It's simpler: know the number, then choose. Check the air before you head out, run when and where it's clean, and on smog, wildfire or high-pollen days move the session indoors into a HEPA-filtered room. Your motivation stays the same — your dose doesn't have to.
Here's the uncomfortable part: the air you breathe is often several times worse than you'd guess — a rush-hour commute, a hotel room with the windows sealed, an open-plan office, a kitchen mid-dinner. And the worse it is, the more it quietly costs you.
Yet no one has any reason to warn you:
The only way to know is to measure it yourself. A $60-100 monitor turns an invisible risk into a number you can act on — which is the whole point of everything below.
"Just air the room out" is only right half the time. The honest rule takes 10 seconds:
One indoor monitor + one free outdoor map = every ventilation decision, solved. No second meter needed.
Per kilo of body weight, young children inhale far more air than adults — in the same room, they get a bigger dose of whatever is floating in it. Fresh paint, new furniture, cooking particles, outside smog leaking in: the nursery is where clean air matters most, and it's also the cheapest room to fix.
A child's lungs are still being built. Damage done now doesn't undo itself later — and the finest particles don't stop at the lungs; they reach the bloodstream.
One monitor + one small purifier ≈ $180. That's the whole intervention for the room where your child spends 10-12 hours a day.
No vibes, no vague "studies show". Each claim, its paper:
Honest disclaimer: these are population-level statistics — averages across thousands of people, applied pro-rata to time spent at home. They are the best science available on cause and effect, but they are not a personal medical prediction, and this is not medical advice. It's math — so you can make an informed choice about where your money goes.