PM2.5
PM2.5 measures the concentration of fine particles smaller than 2.5 microns in
the air and provides insight into particle pollution from indoor sources.
What is PM2.5?
PM2.5 is the measurement of fine airborne particles with a diameter of less than 2.5 microns, typically expressed in micrograms per cubic meter (µg/m³). These particles include dust, soot, smoke, pollen fragments and chemical compounds, and they are small enough to be inhaled deep into the lungs. PM2.5 often enters buildings from outdoor sources such as traffic, construction and wildfire smoke, but it is also generated indoors by cooking, candles and cleaning. Measuring PM2.5 helps building, workplace and facility teams track particle pollution and see when ventilation or filtration needs adjusting.
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Why does PM2.5 matter?
PM2.5 isn't just an outdoor problem. Fine particles easily find their way indoors, where they can affect health, comfort and wellbeing.
Protect occupant health
PM2.5 can irritate the eyes, nose and throat, trigger asthma and allergies, and worsen heart and lung conditions. Children and older people are especially vulnerable, making PM2.5 monitoring important in schools, healthcare facilities and offices alike.
Respond to outdoor pollution
Traffic, construction and wildfire smoke can quickly raise indoor PM2.5 levels. Real-time data shows when outdoor pollution is entering your building, helping you adjust ventilation, reduce air intake and protect occupants during high-pollution periods.
Maintain HVAC performance
Rising PM2.5 levels can be a sign that filters are clogged or ventilation systems need servicing. Monitoring helps you plan maintenance based on actual conditions rather than fixed schedules, keeping air clean while extending the life of your equipment.
PM2.5 over time
Track fine particle levels across rooms and buildings in real time. See when outdoor pollution or indoor activities cause PM2.5 to rise and follow trends over time, so your team can adjust ventilation, plan filter changes and keep the air clean for everyone inside.

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See PM2.5 levels in your buildings
Curious about the PM2.5 levels in your buildings? We'll show you what PM2.5 looks like in the Airthings dashboard.

Explore related insights
PM2.5 is one signal among many. Combine it with these for a complete view of your indoor environment.
PM1
PM2.5
Radon
VOC
Temperature
Humidity
Light
Pressure
Noise
Virus risk
Mold risk
Ventilation rate
Space utilization
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