Your lungs clear most of what you breathe — but the finest particles (PM2.5) can slip past and, research finds, even cross into the bloodstream. Here's the honest math for your household: what your air might be costing you, 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 may mean for your health over time.
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 like your home, then fine-tune. Read this first: the "healthy months" below is an illustration, not a personal prediction — we take a population-level finding (the University of Chicago's Air Quality Life Index, based on long-term outdoor PM2.5) and apply it to your inputs to show rough scale. Real effects vary from person to person.
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 blind spot: the air you breathe is often worse than you'd guess — a rush-hour commute, a sealed hotel room, an open-plan office, a kitchen mid-dinner. It's simply not something anyone measures for 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 developing, and little ones breathe faster than adults — so clean air in the nursery genuinely matters. The good news: it's also the cheapest room to fix.
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.