Frequently Asked Questions about Air Quality and Purifiers



Gobal questions about air purifiers

What is an air purifier?

An air purifier is a device that captures the pollution of the air…

Easy to say, but not easy to do: there are three major families of pollution, and in each family, different types (types of molecules). A good purifier must have a broad spectrum of efficiency; otherwise, it is not really useful and gives you a false sense of security.

More details about air purifiers

What are the different indoor pollutants?

There are 3 categories of pollutants in indoor spaces:

  • physical particles, called “fine particles” (automobile combustion residues, cigarette smoke, emanations of electronic components, etc.);
  • volatile organic compounds (formaldehyde, benzene, trichlorethylene, …);
  • micro-organisms (bacteria, molds, viruses, …).

The sources of these pollutants are various: outdoor pollution (fine particles), cleaning products and decorative materials (formaldehyde), activities of people (smoke, household products, candles, incense), …

Get to know the air pollutants

Why would I purchase an air purifier?

It is now well known: the impact of air pollution on health is dramatic.

The ideal way to protect yourself would be to ventilate your home, especially in the evening, so that you can leave your lungs in a healthy night air. But -let’s be honest- nobody aerates enough, because of noise, cold, rain, wind … (not to mention the cost of heating after aeration).

So the best solution for your health is to treat the air with a purifier!

Does a purifier remove odors?

Odors are composed of chemical molecules, and sometimes molds.

A good purifier removes the odors: tobacco, cooking, paint, sweat, pet smells, …

But beware: smells are not signs of pollution: some rooms without odors can be very polluted, and some rooms with many smells can be healthy.

Air purifier, humidifier or air conditioner?

The three devices are very different, even complementary. But Air Quality really depends on the three devices.

  • The air conditioner adjusts the temperature. It aims to put the room between 18 ° C and 21 ° C: colder, you will be sensitive to microbes; hotter, microbes and molds will grow.
  • The humidifier adds relative humidity… But in reality, the relative humidity must be within an ideal range of 40% to 60%. If you moisten more, mold will grow. If you humidify less, you will have dry airways, so you will be sensitive to pollutant attacks.
  • The purifier removes pollution without changing the humidity or temperature. But Air Serenity purifiers indicate the temperature and relative humidity, and consider these elements as parameters to determine the air quality.

Air purifier in practice

Where should the air purifier be located?

The air purifier should be ideally located in your bedroom or your office: you spend most time there, so it is worth letting your lung breathe clean air.

Set it up in a corner of the room, around 30 cm (1 ft.) away from the wall, facing the room. If possible, put it in the opposite corner of the room window.

Does an air purifier make noise?

Not too much.

Obviously, a purifier must stir the air: otherwise, it purifies the air that is directly in contact, so it is useless… It’s like putting sugar in a cup without stirring.
So a purifier requires a fan.

But you can put the purifier into operation just for half an hour, for example while you are having dinner, so that the air in your room is healthy on your return, and you breathe clean air during the night.

Which air purifier to choose?

A Serenity Air Purifier, of course!

Seriously, opt for a purifier that captures all pollution, so fine particles (most devices are able to…), a large number of VOCs (there is more rare) and viruses (it is rare too).


Air quality measurement

What air quality parameters do you measure?

Like all mass-market devices, we measure temperature, humidity, CO2, Particulate Matter and Total VOC levels.

Total VOC means a global measurement of molecules with various harmfulness. The measured value is therefore not scientific, but it allows to follow a global trend of pollution.
This explains why two devices of different brands could display different total VOC values, but the evolution of this number should be similar.

Is the measurement of air quality reliable?

Air quality sensors are reliable at the time of shipment, but the measured values “drift” over time. Typically, after 1 year, the values are accurate within 15%; and after 2 years, the values are often totally wrong.

Worse: after two years, similar sensors can have very different behaviors: one will show that the air is very clean, and the other that it is very polluted.

This can be a problem for the “automatic” mode of the purifier, because this mode is based on the quality measured by these sensors.

At Air Serenity, we decided to put our sensors in our cartridges, to be able to recalibrate them each year, when recycling the cartridge. Thus, the measurement of air quality remains reliable.

Air Serenity purifiers

Who are the Air Serenity purifiers for?

Air Serenity devices are for everyone who breathes: few places have a healthy air, and 90% of human beings are breathing polluted air!

As a priority, we address people with asthma, allergies and breathing difficulties but also to all sensitive people such as infants, children and the elderly.

In general, our devices provide well-being to people who are already suffering and can reduce the occurrence of respiratory diseases for sensitive people.

How does Air Serenity’s Aurora technology work?

Aurora’s unique, patented technology works in three steps:

  • firstly, the fine particles are blocked in a HEPA filter. This step is classic, and we realize it “like everyone else”
  • then, the air passes through a network of mineral materials that are molecular sieves and will fix the chemical pollution; the choice of various materials makes it possible to capture many pollutants
  • finally, the pollutants are eliminated thanks to a cold plasma: they are converted into water and carbon dioxide, and the possible residues of the molecules are firmly fixed onto the materials. In addition, plasma eliminates microbial pollution by dismantling their walls.

Does Aurora technology really capture more chemical pollution than other technologies?

Yes it does!

Aurora technology combines 8 kind of sieves to capture pollution. These sieves have been selected from hundreds, so that their efficiencies are optimal and complementary, targeting the most common pollutants of the home.

There are hundreds of VOCs, so it is essential to target a maximum of them.

How to maintain Air Serenity devices at their top efficiency?

Air Serenity devices use a single cartridge to treat all pollutants over a period of about one year. The plasma cleans the cartridge automatically, so you don’t have to worry about the maintenance of the device, it is designed to work in total autonomy.

The filling of the cartridge is indicated on the mobile application or on the site Also, when the cartridge approaches saturation, a light of the device flashes (see instructions).

How long does the cartridge last?

The cartridge is designed to last about a year in operation, but this time varies greatly depending on the environment of the device: in a room often filled with cigarette smoke, the duration will be shorter; and in a healthy environment (e.g. if you pay attention to the cleaning products you use, etc.), the duration will be lengthened.

If the device is not used, the duration of the cartridge will be logically extended.

Why are you proposing different types of cartridges?

Air pollutants are often specific to the environment: city pollution (strongly linked to automobile traffic) is not the same as in rural areas (where the air is polluted by fertilizers). Often sewage treatment plants or lifting pumps cause very strong odors.

Air Serenity has therefore developed several cartridges, according to the needs of users. These cartridges correctly target the “traditional” pollution of the home, but more itensely specific pollution: for urban areas, rural, for smokers, to treat odors.

Does Aurora technology produce CO2?

Aurora technology produces a very small amount of CO2: in the year of use of the cartridge, the technology produces as much CO2 as a single human breath.

Does Aurora technology require a lot of energy?

Aurora technology itself does not require much energy: about 5 W.

Ventilation consumes a little energy, and it depends on the speed of the fan.

Overall, the device has been eco-designed, which helps minimize overall energy consumption.

Does Aurora technology produce Ozone?

No, Aurora technology does not produce Ozone, for two reasons:

  • on the one hand, the plasma is generated in a “clean” way, from electrical flashes which go from 0V to 15 000 V in a fraction of a second. The rapid rise in voltage ensures that no ozone is generated. This is one of Air Serenity core know-how, developed at the Ecole Polytechnique, in the laboratory of plasma physics.
  • on the other hand, the molecular sieves also capture the ozone. So if ozone were produced, it would be captured immediately.

What is a plasma?

Plasma is a state of matter, just like solid, liquid and gaseous states.

It is a state where the gas is ionized, and this gives some new properties to the environment. Generating plasma around Air Serenity anti-pollution traps, is like humidifying a sponge: the dirty parts are captured far better than with a “dry” sponge, and they are dissolved into the sponge. Technically in our case, the traps capture the pollutants, and the ions of the plasma oxydize the VOC molecules.

There is very little plasma on Earth. We see them in the lightning, or in the northern lights (also called… Aurora borealis).


Other questions

What should we think of depolluting plants?

Honestly, they are not really useful: some of them capture some pollutants very locally. No serious study has proved that they are useful.

What should we think of essential oils?

Honestly, they are not really useful either. They add a smell, so they mask the ambient odor, but they do not eliminate pollutants at all (nor their harmfulness).