PM2.5 is a term that increasingly appears in news reports about air quality, but what exactly does it mean and why is so much attention paid to it? This article explains what PM2.5 is and why these fine dust particles are relevant to your health.
What does PM2.5 mean
PM stands for particulate matter. The number 2.5 indicates that these are particles with a diameter of 2.5 micrometers or smaller, which is about thirty times thinner than a human hair. These particles are so small that they are not stopped by nose hairs or mucous membranes and can penetrate deep into the lungs.
Where does PM2.5 come from
- Traffic, especially diesel engines and brake wear.
- Industry and energy generation.
- Wood stoves and fireplaces.
- Indoors: cooking, candles, and smoking.
Why PM2.5 is important for your health
Because PM2.5 particles are so small, they can enter the bloodstream via the pulmonary alveoli. Long-term exposure is associated with respiratory problems and increased strain on the heart and lungs. In its fact sheet on air quality and health, the World Health Organization identifies particulate matter as one of the main causes of heart, vascular, and lung diseases due to air pollution. For people with asthma, COPD, or cardiovascular disease, a higher PM2.5 concentration can cause additional symptoms. This does not mean that a single day with elevated levels immediately causes health damage, but it is a reason to pay structural attention to air quality, both indoors and outdoors.
How do you know how high the PM2.5 level is
For outdoor air, the RIVM publishes current measurements via the National Air Quality Monitoring Network. Background information on how particulate matter is measured and which standards apply can be found in the RIVM dossier on particulate matter. For indoors, you can use an air quality monitor that displays PM2.5, often along with temperature, humidity, and CO2.
Limiting PM2.5 indoors
Ventilate while cooking and use a range hood. Close windows temporarily if the outdoor air quality is poor, for example during smog or heavy traffic nearby. An air purifier with a HEPA 13 filter, such as the AirPure Plus PA244, filters particulate matter including PM2.5 particles from the air that flows through the device. According to the specifications, the filter removes up to 99.97 percent of these types of microparticles, which can contribute to cleaner air in the home. Keep in mind that an air purifier does not change the outdoor air and is not a substitute for ventilation.
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