Before buying a device for your indoor air, identify possible sources of pollution and check your ventilation: Anses and ADEME recommend prioritising these steps. You could then consider an air purifier for a specific pollutant and room. A monitor is more useful for observing changes; it doesn’t treat the air or provide a diagnosis.
If you’re concerned about dust, pollen or particles in a particular room, check the filter, the stated coverage and the noise level at the speed you plan to use. Anses lists particles and biological contaminants among indoor air pollutants.
After cooking or using a scented product, first look for ways to reduce the source. Then consider particles and gases separately: an odour alone isn’t enough to identify the pollutant causing it.
If you’re not sure when the problem occurs, a monitor can help you track the parameters it measures and decide when to ventilate or look for a source. ADEME describes this use of micro-sensors, while Anses highlights questions about the reliability of their readings.
To choose between prevention, monitoring and filtration, start with the problem you want to solve: an identifiable source, a need to refresh the air, a pollutant to monitor or particles to filter in a particular room.
When: You can identify a product or activity in your home that may be releasing pollutants.
Bear in mind: This may mean changing your habits. If there’s a building issue or mould that needs professional attention, it should be dealt with appropriately.
When: You need to check how well the air is being refreshed, particularly if household activities regularly generate pollutants.
Limit: Results depend on your home, its ventilation system and the conditions outdoors. This approach doesn’t target a single pollutant.
When: You’ve identified a particular room and pollutant for which filtration could be considered alongside the first steps.
Limit: Your choice depends on the filter, the airflow at a tolerable noise level and ongoing maintenance. A stated feature won’t necessarily apply to every pollutant.
When: You want to track changes to help decide when to ventilate or look for a source.
Limit: A monitor doesn’t treat the air. Its readings depend on the parameters it tracks and aren’t a substitute for a reference measurement.
| Concern | What to check | Consumers concerned |
|---|---|---|
| Particles and allergens | Type of filter designed for particles; airflow and noise for the room and speed you have in mind. | In a bedroom or another specific room, I want to choose filtration suited to particles without assuming it also treats gases. Around 33% of consumers prioritise this need. |
| Odours and household emissions | Source to reduce first; whether the device has an activated carbon filter if you then decide to buy one. | If an activity or product is causing an odour, I want to find out where it’s coming from before relying on a particle filter. This is the top priority for around 25% of consumers. |
| Monitoring the air | Parameters actually measured by the monitor; reliability of its readings and what action to take if they change. | When I’m not sure when a problem occurs or what’s causing it, I’d rather track a relevant parameter before choosing a treatment. Around 25% of consumers put this approach first. |
| Noise and maintenance | Noise level at the speed you need; how often compatible filters need replacing and how readily available they are. | If the device needs to run in an occupied room, I want its noise level to be manageable and to be able to maintain it properly. This is the main consideration for around 17% of consumers. |
ADEME recommends reducing sources and refreshing the air first. A device may leave a source of emissions in your home unaddressed or distract you from a ventilation problem.
Identify possible sources and check your ventilation before deciding what the device should target.
A filter designed for particles won’t, by itself, tell you whether gases and odours are also treated. A summary of tests by the Institut national de la consommation and ADEME distinguishes between microparticles and volatile organic compounds, among other things.
Check which pollutant the filter targets, what it contains and which replacement filters are compatible. Don’t assume a filtration claim applies to every pollutant.
Micro-sensors don’t all track the same parameters. Anses says their measurement reliability should be considered before interpreting the results.
Choose a parameter that relates to your concern, then use changes in its readings to guide a practical step, such as ventilating or looking for a source.
The noise level quoted for the lowest setting may not reflect the speed you’ll actually use. Filters and replacement guidance also vary by model.
Compare noise levels at the speed you need and find out the replacement filter reference before choosing a device.
Rowenta offers domestic air purifiers in a range of formats. Filtration features and coverage vary by model.
Philips offers air purifiers and replacement filters, with filter compositions and compatible references varying between ranges.
Dyson offers air purifiers and purifier fans, with replacement filters listed for specific models.
These models are designed to filter the air in a room. Compare them by pollutant targeted, stated coverage conditions, noise and maintenance. They don’t replace source reduction, ventilation or airing out your home.
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Worth considering if you’re targeting particles in a room and also want to look at an activated carbon filter for odours.
The product title mentions an H13 filter, coverage of up to 1190 ft², Wi-Fi and Alexa control, and a sleep mode rated at 23 dB. According to the description, the maximum coverage is based on one air change per hour. Check the coverage and noise level at the setting you’ll need.
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Worth considering when comparing particle filtration for a specific room. Don’t assume that the stated airflow means it’s effective against every pollutant.
The title specifies an H13 filter, a stated clean air delivery rate (CADR) of 450 m³/h and a 24-hour timer. Check the noise level at the speed you plan to use and the reference of the compatible filter.
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Worth considering if particles are your priority and you want to compare the stated coverage with the size of your room.
The title mentions HEPASilent technology and coverage of up to 43 m². If you’re buying it to tackle odours or gases, check separately which filter media is intended for this purpose and the reference of the replacement filter.
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Worth considering for a small room if you want to compare particle filtration and the inclusion of a carbon filter.
The title states a clean air delivery rate of 150 m³/h, three speeds and HEPA and carbon filters. The description gives different coverage figures, so ask for confirmation of the coverage for this model before choosing. Also check the noise level at the setting you plan to use.
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Worth considering if you’re comparing room coverage conditions and filter maintenance.
The title states coverage of up to 130 m², an automatic mode and a HEPA filter said to last up to five years. According to the description, the maximum coverage is based on one air change per hour. Check what’s suitable for your room, how long the filter will last with your usage and the noise level at the speed you need.
No. ADEME recommends reducing sources of pollution and refreshing the air first. An air purifier should only be considered as an addition for a specific need; it won’t fix a ventilation problem.
First, try to reduce the source and refresh the air. If you then consider an air purifier, check whether it has an activated carbon filter and confirm the filter reference. Particle filtration alone doesn’t show that the device treats gases or odours.
No. Its readings alone aren’t a diagnosis. ADEME says a micro-sensor can help you track certain parameters, but Anses highlights limitations to bear in mind when interpreting its measurements. Check what your chosen model measures before acting on its readings.
Follow the guidance and indicator for your model: replacement frequency depends on the filter and how you use it. Dyson generally recommends replacing its filters after 12 months with typical domestic use, while Philips gives different lifespans for different models. These recommendations aren’t interchangeable.