Does an air purifier help against indoor particulate matter?

Does an air purifier help against indoor fine dust? Yes — an air purifier with a certified HEPA 13 filter captures over 99.95% of fine dust particles (PM2.5 and PM10). Indoor fine dust is an underestimated problem: the concentration in an average household is often higher than outdoors, due to cooking, vacuuming, candles, printers, and cigarette smoke. An air purifier that runs continuously can drastically reduce that concentration within a few hours. Direct answer: A HEPA air purifier is the most effective way to reduce indoor fine dust. Use it continuously in the rooms where you spend the most time — living room and bedroom — for a measurably lower exposure to harmful particles. What is fine dust and why is it dangerous? Fine dust is the collective term for airborne particles smaller than 10 microns (PM10). Particles smaller than 2.5 microns — referred to as PM2.5 — are particularly dangerous because they are so small that they penetrate deep into the lungs and can even reach the bloodstream. Long-term exposure to PM2.5 has been linked to cardiovascular diseases, lung diseases, strokes, and premature death. The World Health Organization (WHO) significantly tightened safe limit values in 2021, indicating how seriously the problem is being taken. Where does indoor fine dust come from? Many people immediately think of traffic and industry when they hear about fine dust, but indoor sources are at least as diverse. Cooking is the biggest peak source: frying over high heat can push the PM2.5 concentration in the kitchen to ten times the outdoor value within minutes. Candles and incense sticks produce fine combustion particles; printers and copiers emit toner; vacuum cleaners blow small particles back into the air through the exhaust filter. And if outdoor air is already polluted — during peak traffic or a heatwave — it seeps inside through ventilation. Source Type of particles Relative effect on indoor air quality Cooking (frying, searing) PM1 – PM2.5 Very high (peak exposure) Candles and incense PM1 – PM2.5 High with prolonged use Vacuum cleaner (without HEPA) PM2.5 – PM10 Moderate to high Pets PM10 (hair, dander) Moderate, continuous Cigarette smoke PM1 – PM2.5 Extremely high Outdoor air (infiltration) PM2.5 – PM10 Dependent on location How effective is a HEPA filter against fine dust? A HEPA 13 filter is rated to capture at least 99.95% of particles of 0.3 microns — the most difficult particle size to capture in the filtration spectrum. For larger particles (PM10, PM2.5), the efficiency is even higher. This means that out of every 10,000 fine dust particles entering the filter, fewer than 5 pass through. In practice, studies measure a 50 to 85% reduction in indoor PM2.5 concentrations when using a correctly sized air purifier continuously. Placing an air purifier next to the stove: a good idea? Yes, but ensure the device does not disrupt the supply of fresh air. The ideal position is at the edge of the cooking area, so that fine dust is captured before it spreads through the room. Combine this with a good extractor hood over the stove for the best results. Turn the air purifier on before you start cooking — it takes a while for the air to pass completely through the filter. The Dynter AirPure Plus PA244 and fine dust The Dynter AirPure Plus PA244 is equipped with a HEPA 13 filter with a built-in activated carbon layer. The integrated air quality sensor continuously measures the PM2.5 concentration in the room and automatically adjusts the fan speed. This way, you don't have to think about anything: the machine reacts as soon as cooking, candles, or another source causes the air quality to drop. The HEPA 13 replacement filter is easy to order and replace. We recommend changing the filter every 6 to 12 months, depending on how actively you use the air purifier and how polluted the air is in your environment. Do you want to compare which model best fits your home? Take a look at the full range at dynter.eu/collections/luchtreinigers. Frequently Asked Questions Is indoor fine dust more dangerous than outdoor fine dust? Not necessarily more dangerous, but people spend on average 80 to 90% of their time indoors. Consequently, for most people, total exposure to fine dust is primarily an indoor problem, even if the concentration per m³ is lower than outdoors. Does opening a window help reduce fine dust? In some cases yes, in others no. If the outdoor air is cleaner than the indoor air (low traffic, no heatwave), ventilating helps. With high outdoor concentrations — peak traffic, wood burning nearby — you actually bring extra fine dust inside. An air purifier works independently of outdoor conditions. Can an air purifier also remove CO2? No. CO2 is a gas, not a particle, and is not removed by HEPA filters or activated carbon. For CO2 reduction, ventilation with outdoor air is the only solution. A CO2 monitor helps you determine when you need to ventilate. How do I know if my air purifier has enough capacity? Divide the volume of the room (length × width × height) by the CADR value of the device. The result indicates how many minutes are needed for one air exchange. Aim for less than 15 minutes per exchange for good protection against peak exposure. Should I leave the air purifier on when I'm not home? Yes, if you can afford it in terms of energy costs. An air purifier on its lowest setting uses very little power and ensures you come home to a room with clean air. Many models also have an automatic mode that puts the device into sleep mode when air quality is good. How long does a HEPA filter last with daily use? With daily use of 8 to 12 hours, a HEPA 13 filter lasts on average 6 to 9 months. In environments with a lot of fine dust — busy street, pets, smokers at home — replacement after 4 to 6 months is advisable. Regularly check the color of the filter: changing from white to gray-brown is a sign of saturation.