Indoor Air Guide
PM2.5: the invisible dust risk in your home
You can't see it. You can't smell it. But PM2.5, particles smaller than 2.5 microns, is in every breath you take right now. Here's what a safe level looks like and how to clear it fast.
Keep PM2.5 below 9 µg/m³ (EPA's "Good" AQI threshold, updated in 2024 to match the current annual PM2.5 air quality standard). Particles this small, smaller than 2.5 microns, are small enough to pass through your lungs directly into your bloodstream. Common indoor sources are cooking, candles, dust, and traffic infiltrating from outside. A reading of 48 µg/m³ is elevated: not an emergency, but not something to ignore, ventilate and run a HEPA purifier.
Most people never check this number. But once you know it, you can't unsee it. Cooking, candles, or dust tracked in from outside can push a room's PM2.5 well past what feels like "clean" air.
The 6 categories of PM2.5
These bands mirror the U.S. EPA's PM2.5 Air Quality Index breakpoints (24-hour average), updated in 2024 to reflect the current annual PM2.5 air quality standard.
Small enough to pass through your lungs, directly into your bloodstream.
PM2.5 stands for particulate matter smaller than 2.5 microns, roughly 30 times thinner than a human hair. You can't see it, and you can't smell it, but it's in every breath you take.
At 48 µg/m³, the level is elevated, not an emergency, but not something to ignore either. Unlike larger dust, particles this small bypass your body's natural filtering and settle deep in lung tissue.
Most people never check this number. But once you know it, you can't unsee it, and the fixes are simpler than you'd expect.
How to clear PM2.5 from a room
Fine particles settle fast once you remove the source and filter what's left.
The most effective fix
HEPA filtration captures particles down to 0.3 microns, well below PM2.5, and clears a room far faster than ventilation alone on high-pollution days.
Stop outdoor particles at the door
Traffic exhaust is a major PM2.5 source. If you're near a busy road, close windows during peak traffic and rely on filtered air instead.
Your stove is a top source
Run the range hood or open a window while cooking, especially frying or searing, a major and avoidable spike in indoor PM2.5.
BAVAMA catches the spike before you smell smoke.
Cooking, candles, or dust tracked in from outside, BAVAMA flags the moment PM2.5 climbs, well before it's obvious in the air.
- 1Live PM2.5 tracking alongside CO2, VOCs, humidity, and temperature, the full picture of a room's air.
- 2Plain-language explanations, so "48 µg/m³" becomes "elevated, likely cooking or dust, run the purifier."
- 3Source hints tied to your routines, right after cooking, cleaning, or a window left open near traffic.
PM2.5, answered
PM2.5 refers to particulate matter smaller than 2.5 microns, small enough to pass through your lungs directly into your bloodstream. Larger particles get filtered by your nose and airways; PM2.5 largely bypasses those defenses.
Below 9 µg/m³ is EPA's "Good" AQI threshold for PM2.5, updated in 2024. Levels up to 35.4 µg/m³ are generally considered moderate to unhealthy-for-sensitive-groups; above that, sensitive groups and eventually everyone can be affected.
Cooking (especially frying or searing without ventilation), candles, dust, and traffic pollution infiltrating from outside are the most common indoor sources. Fireplaces and unvented gas appliances can also contribute significantly.
Yes. True HEPA filters capture particles down to 0.3 microns with over 99% efficiency, which covers PM2.5 comfortably. A properly sized HEPA purifier is one of the most effective tools for clearing fine particles indoors.
Yes, on days with elevated outdoor PM2.5, skip the long outdoor workout. If you need fresh air, choose morning or evening when traffic, and often particle levels, are lower, and keep windows closed if you live near a busy road.
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