A filter-based air purifier can complement source reduction and ventilation when the remaining need is to tackle particles in a particular room. ADEME prioritises reducing emissions and replacing indoor air: a standalone appliance is no substitute for either. Before choosing one, check which pollutant you want to target, the airflow rate suited to the room, the noise level at the speed you need and filter maintenance. The presence of activated carbon alone does not prove that a purifier is effective against gases.
If odours, damp or emissions from cooking, cleaning, DIY or combustion persist, start by distinguishing the source of the problem from any potential need for filtration. ADEME recommends reducing emissions and replacing indoor air before considering additional air treatment.
If the remaining need in a bedroom or living room is to deal with pollen, dust or smoke, compare the clean air delivery rate, room volume, noise at the setting you’ll use and filter replacement requirements. The French National Consumer Institute (INC) also assesses these factors in its air purifier tests.
If you’re looking to tackle volatile organic compounds (VOCs), formaldehyde or odours, identify their source first. Then check whether the available data applies to the pollutant and model you’re considering. According to Anses, the results of an air-treatment process cannot be taken as proof of its general effectiveness in a home.
Start by reducing sources, then focus on replacing indoor air. Filtration addresses a different question: is there still a need to tackle particles in a particular room, which a suitably chosen appliance could help with?
When: an activity, product or appliance is still emitting identifiable pollutants.
What to expect: changing how you use something or removing the source may take practical action, but it means you won’t be relying on a filter to deal with ongoing emissions.
When: indoor air isn’t circulating well or moisture from everyday household activities persists.
Worth considering: opening windows also depends on the quality of the outdoor air, while an air purifier cannot replace the air in a room.
When: the remaining need is to tackle particles in a specific room, after addressing sources and ventilation.
Bear in mind: results depend on the pollutant, the airflow rate used, the room and the condition of the filter.
| Concern | What to check | Consumers concerned |
|---|---|---|
| Whether an appliance is the right choice | Identify the activity or emissions involved, and check that air inlets and outlets are working before looking for an additional solution. | If emissions persist or the air isn’t circulating well, I want to tackle the cause rather than rely on an appliance. Around 33% of consumers make this their priority. |
| Particles in a room | Compare the stated clean air delivery rate, or CADR, in m³/h with the room you want to treat, then check the noise level at the setting you need. | For pollen, dust or smoke in my room, I’m looking for filtration I can run at the required airflow rate. This is the priority for around 27% of consumers. |
| Gases and odours | Identify the source and look for results that apply to the gas you want to tackle and the exact model. Don’t draw conclusions from the words ‘activated carbon’ alone. | If there’s an odour or VOC emission, I want to know whether the appliance can tackle that pollutant, without delaying the removal of an accessible source. Around 20% of consumers prioritise this issue. |
| Everyday use | Check noise levels at different speeds, how often filters need replacing and whether replacements are available. Also look for data specific to any active technology. | An appliance I have to switch off because it’s too noisy, or whose filter I can’t maintain, won’t suit my needs. For around 20% of consumers, these practical considerations come first. |
According to ADEME, reducing sources and replacing indoor air remain the priorities. A standalone appliance won’t address the cause of ongoing emissions, damp or a combustion problem.
Identify the activities and sources in your home, then check ventilation before deciding what filtration, if any, is still needed.
Room volume, the pollutant, operating speed and filter condition all affect performance. A stated floor area doesn’t tell you which setting will deliver the airflow rate you need.
Compare the exact model’s CADR with the room you want to treat, and check its noise level at the speed you plan to use.
Anses has highlighted that the effectiveness and safety of several active processes have not been generally demonstrated in real-world conditions. Results for one technology or appliance should not be assumed to apply to all the others.
For ionisation, ozonation or another active process, ask for data relevant to the model, pollutant and conditions of use. Don’t overlook the importance of addressing the source and ventilation.
The performance of a filter-based appliance also depends on the condition of its filters. If maintenance is difficult to keep up with, it could affect how you use the appliance day to day.
Before choosing a model, note the filter reference, stated replacement frequency and availability.
The specifications below relate to specific models as described by their manufacturers. They are not indicative of the performance of an entire range or of the results you can expect in your home.
The range includes filter-based purifiers in various sizes, with specifications to compare on a model-by-model basis.
The Pure Air range includes compact filter-based models, with settings and filters that vary by appliance.
Some of Xiaomi’s connected air purifiers list separate stated airflow rates for particles and formaldehyde.
These filter-based appliances are options to consider for tackling a remaining need for particle filtration in a room at home. Compare their stated specifications with your room and how you plan to use the appliance, while continuing to reduce sources and ventilate.
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Worth considering for a room where the remaining need is to tackle particles. Check that the airflow rate is right for the actual room volume.
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This model is worth comparing for particle filtration in a room, provided you check how it performs at the airflow rate you want.
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If you want to filter particles in a room, compare the stated airflow rate with the room volume rather than relying on the floor area alone.
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Worth considering if you need to tackle particles in a large room, after checking the volume to be treated and the setting required.
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If you need to tackle particles in a specific room, check that the specifications match the room volume and setting you have in mind.
No. A standalone air purifier filters the air in a room, but it doesn’t replace ventilation or bring in fresh air. ADEME prioritises reducing sources and replacing indoor air. If your ventilation isn’t working well, look into the problem before buying an additional appliance.
First, distinguish particles from gas or VOC emissions, then look for potential sources in the room. An appliance designed to filter particles won’t necessarily tackle another pollutant. ADEME notes that a microsensor can help guide your investigation, but it isn’t as reliable as a reference instrument.
No. The presence of activated carbon in a filter alone doesn’t show that it can remove enough formaldehyde or VOCs. In tests reported by Que Choisir in 2020, none of the appliances tested effectively removed formaldehyde under the protocol used. This result shouldn’t be applied to every model currently available. Prioritise reducing the source and look for data relevant to the pollutant and appliance you’re considering.
Check the seller’s identity, the exact description of the appliance, the relevant compliance information and the filter reference. The French Ministry of the Economy points out that the legal guarantee of conformity is mandatory for new, second-hand or refurbished goods sold by a business to a private individual in France. This includes goods that don’t match their description.