Do Air Purifiers Work Are They Effective Against Smog?

Air purifiers filter house dust, particulate matter, mould spores, bacteria and the like out of the room air, but their use does not always make sense. For whom and when the device is worth it, read here.


When does an air purifier make sense? The most important things at a glance

  • Air purifiers filter pollen, mould spores, particulate matter and house dust, odours, and bacteria and viruses from the air. Even the most powerful devices, however, remove only a part of the pollutants.
  • For allergy sufferers, asthmatics and people in areas with a high level of particulate matter, an air purifier makes sense.
  • HEPA filters of classes H13 or H14 are installed in high-quality air purifiers. Their functionality is similar to that of Seven. Thanks to the replaceable filters, HEPA systems clean thoroughly and so Air purifiers for allergies Useful. EPA filters also remove particles such as dust from the air, but less efficiently.
  • Air purifiers are often equated with air scrubbers and ionizers. However, their functioning is very different.
  • Air scrubbers wash and moisturize the air with water. Some combination devices combine the function of air scrubbers and air purifiers.
  • Ionizers are chemical cleaners in which ions bind the pollutants. However, their use has drawbacks, as allergy sufferers, in particular, can be sensitive to the by-product ozone. The ionizer is also less useful in smoking households.


For which pollutants and particles do air purifiers make sense?

Asthma and allergies have been on the rise in all age groups for years. Doctors identify air pollution as the most common cause. Air purifiers do not cure the diseases, but they reduce pollution and thus the symptoms. For the following pollutants, an air purifier can be useful.


Are air purifiers useful against pollen?

Those who suffer from a pollen allergy have to contend with permanent colds, itching, burning eyes and more problems, especially in spring and summer. In enclosed spaces, pollen pollution is often higher than outdoors. Air purifiers with highly efficient HEPA filters remove even the smallest particles from the air and significantly reduce the allergen density, so they make perfect sense. However, they do not eliminate pollen – only those that float in the air, not those that lie on the bed, for example. Allergy sufferers with severe symptoms should rely on an air purifier and other Housing tips for allergy sufferers back.


Are air purifiers useful for mould?

In the case of a mould infestation in the home, fungal spores strain the respiratory tract and the immune system. Here, too, the use of air purifiers proves to be useful. The best air purifiers filter over 99 per cent of mould spores out of the air. However, they do not eliminate the cause of mould. Therefore, it is important to remove mould.


Are air purifiers useful against house dust?

House dust consists of organic parts such as skin scales and inorganic parts such as textile fibres. House dust mites are tiny animals that feed on the organic parts. About 10 per cent of Germans suffer from a house dust allergy. Your immune system overreacts to certain proteins in mite faeces. The consequences are headaches, irritable cough and, in the worst case, asthma.

Air purifiers remove dust in the air and reduce transport via air vortices.

Against the dust on objects, however, they are powerless. Allergy sufferers and asthmatics should, therefore, often wipe the floors moist and clean textiles. However, air purifiers can still be a useful addition. For example, if you re-cover the bed, the swirled dust will bring the device to full speed.


Are air purifiers useful against particulate matter?

Particulate matter is produced during combustion processes. The main producers are motor vehicles, industrial plants, power stations and heating systems. Depending on the diameter, the fine aerosols are divided into PM10 (maximum 10 microns in diameter), PM2.5 (maximum 2.5 microns) and ultrafine particles (less than 0.1 microns). In comparison, most bacteria reach a size of 0.5 to 6 microns.

Particulate matter accumulates in the bronchi and lungs, causing respiratory and cardiovascular

diseases. Studies from previous years show that concentrations are higher than in outdoor air, especially in enclosed spaces.

Efficient air purifiers reduce particulate matter pollution in premises by up to 50

per cent. However, they do not eliminate all particles. They are also powerless against gaseous compounds such as nitrogen oxides. However, if you live on the main road or near an industrial area, an air purifier still makes sense.


Do air purifiers help against viruses and bacteria?

While the most common bacteria’s diameter is between 0.5 and 7 microns, viruses are on average a hundred times smaller. Even the most efficient air purifiers are therefore not a miracle weapon against pathogens. They can somewhat reduce the concentration of viruses in the air, but they cannot kill all pathogens. The effect of air purifiers is also limited in bacteria. Some bacteria get caught in the filters, but just as many slips through.


Do air purifiers help prevent the spread of corona?

According to the Federal Association for Mould Remediation e.V., anyone who wants to curb the spread of coronaviruses in rooms must resort to air purifiers with pre-filters and HEPA filters, which have at least class H13. This class must be guaranteed at all levels of performance. Besides, triple airflow per hour is required. To do this, make sure that the manufacturers are specified in cubic meters per hour (m3/h). To get to the minimum value required, calculate the room area times the room height and take the triple airflow times three. Example: Your room is 20 square meters in size and 2.5 meters high – then calculate 20 m2 x 2.5 m = 50 m3 x 3 = 150 m3, which the air purifier should create per hour. But beware: in living rooms, offices, doctor’s offices and shops, air purifiers can be at most a complementary measure, but never common methods such as disinfection and regular,

proper ventilation Replace. In large rooms, the Federal Association of Mould Remediation e.V. recommends setting up several devices with medium airflow instead of just one device with high performance. In this way, a large amount of room air can be detected more effectively.


Air Purifier vs. Air Scrubber vs. Ionisator: What makes sense? What can hurt?

The air purifier is not the same as an air purifier. The devices on the market differ in their functioning and, accordingly, remove pollutants and tiny, harmful particles such as pollen. Some models have drawbacks. Alternatively, you can use an air scrubber or ionizer. However, their mode of action is different, and caution is required for the latter.

An air purifier with HEPA filter: The most effective way of air purification

HEPA stands for High-Efficiency Particulate Air Filter (German: highly efficient particulate air filter). The filters consist of tight-meshed, layered mats made of glass fibres or cellulose. Unlike a sieve, where the mesh size remains the same, the different layers’ meshes are different tight.

a Fan for the circulation of the room air, which is sucked in by a nozzle. Small particles that move with the airflow remain stuck to the fibres due to the diffusion effect or the blocking effect. Particles with a larger mass, in turn, have greater inertia. They will therefore sooner or later collide with the meshes. HEPA filters are divided into classes from 1 to 17, depending on efficiency. Class H13 filters remove more than 99.95 per cent of the particles from the air that are larger than 0.1 microns.

pollution. The HEPA filters remove pollutants and harmful particles such as pollen, Mold dust mechanically and do not use harmful chemicals. This means that side effects are not affected. Many air purifiers with HEPA filters also include activated carbon filters, eliminating unpleasant odours and gases. It would help if you replaced both types of filters no later than every six months. Often the filters can also be cleaned.


Air scrubber: Useful for cleaning and humidifying

Air scrubbers also clean the air mechanically. Unlike air purifiers, however, they do not require filters. Inside, discs rotate, on the surface of which there is water. A fan sucks in the air flowing over the panes. The dirt particles remain in the water.

The advantage of air scrubbers is the simultaneous increase in humidity. They are instrumental in winter in heated rooms to maintain healthy humidity. On the other hand, they are not as effective for the smallest particles as air purifiers with HEPA filters. They are therefore more suitable for cases where air purification is not in the foreground. However, there are also air scrubbers with HEPA filters.


Ionizers: Less useful for allergy sufferers and smokers

An ionizer is a chemical air purifier. The device produces negatively charged ions that attract the positively charged pollutants in the air. Heavy molecules form that sink to the ground or stick to a metal plate in the device. Ionizers have no filters. Compared to air purifiers and air scrubbers, they are more compact and often cheaper.

Its major disadvantage is the formation of ozone by the ionization of oxygen in the

air. Ozone splits odour molecules and kills bacteria. However, if the concentration is too high, it irritates the mucous membranes and causes headaches. High-quality ionizers produce little ozone, but asthmatics and allergy sufferers should choose other devices for air purification. Ionizers are also unsuitable for smokers who want to get rid of the smell of cigarettes. Ozone combines with the degradation products of tobacco and forms harmful aerosols.

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