NGK Spark Plug Co develops new plasma air purifier

This kind of air "purifier" ionizes air and as a result produces ozone, a lung irritant even at very low concentrations. The also produce significant EMF. The best choice for a room or whole house air filtration system is US level HEPA filtration (what the EU calls HEPA is not as strict as the US DoE standard originally developed to filter air in plants handling nuclear fuels, later the standard was applied to vacuum and home air filtration) to capture the smallest particles combined with activated charcoal filtration to clean up VOCs, smoke and fumes conventional filtration and this plasma filter do not capture.

significant EMF

Unbelievable!

Desert Tortoise, great comment.

Amazing the article does not mention this critical fact that the product is an ozone generator (their Japanese website says so).

Generally, ozone can be ok to clean a room IF there are no living things in the room (including plants/pets) and you wait some time (like 30-60minutes) to enter the room after the machine shuts off. But I think quite a pain if you have to leave the room while the machine works.

I built a working ioniser when I was a kid hoping for hayfever relief. One of my air purifiers (I live in a heavily polluted industrial area) has one built-in. Ionisers use electrostatically charged plates to produce positive or negative gas ions. They incidentally produce a tiny amount of ozone. They do help in air purification, inactivating viruses [https://en.wikipedia.org/wiki/Air_ioniser]. Many aircon units have them, although I have only mastered Japanese aircon remotes up to the point of providing warm or cold air.

Ozone generators use a corona discharge tube or UV light to produce ozone. At low levels, this has no effect on contaminants. At high levels it can be toxic. [https://www.epa.gov/indoor-air-quality-iaq/ozone-generators-are-sold-air-cleaners]

In general, running a HEPA filter at full power when you are not in a room, and reducing it to a quiet setting or turning it off when you are, is the next best thing to proper aircon. But you need to keep your windows and doors shut for it to work, especially if you are trying to reduce pollen levels. The Covid/open-windows thing negates the value of indoor HEPA filter use.

I'm not certain which device this is. The article requires more detail.

[Sources: Wikipedia; EPA; Dangerous teenage activities with high voltages.]

The Covid/open-windows thing negates the value of indoor HEPA filter use.

Any allergy reduction program will tell you to open your windows at every opportunity. Why? Outside air, surprisingly, is generally cleaner than indoor air. There are some grim places were this is frequently not the case but by and large it is true. Do some careful reading of information from sources that are not affiliated with a company selling air filtration systems. Those are selling you a filter, not telling the whole truth and tend to exaggerate the dangers of outside air. Airing the house out in most cases helps immeasurably. Dust mites and VOCs from cleaning chemicals, paint, carpets and upholstery (they all off-gas some solvents used in their manufacture to some degree) are indoor pollutants not found in outside air. Pollen is heavy and tends to fall to the floor where it sticks. No air filtration system captures all of it. The best defense against pollen is a HEPA filtered (to the US DoE HEPA standard) vacuum cleaner.

It’s beyond bizarre everyone thinks they’re an ionizer expert, who are you people? Why do you think you know something you don’t? It’s really weird man.

Ionizers do not accumulate ozone, they reduce it. Ionizers do not increase EMF, they reduce it.

These are not disputed. Do you people work for hepa companies? Answer yourselves.

Desert Tortoise.

I live in an area with high levels of airborne industrial pollution. Sometimes it really stinks outside and burns the back of your nose and throat in a few minutes. Add pollen to that and it is very nasty. HEPA filters - I doubt US ones are available in the UK - on my vacuum cleaner and air purifiers help, but here, you keep the doors and windows shut, if only to minimise the thick layers of blue dust that build up rather quickly.

Covid presents zero threat if nobody in a property has it, and there is no reason to open a window to 'let it out'.

Hayfever sufferers do not benefit from sitting near open windows, and allergy reduction programmes for hayfever are as much a fantasy as for those with nut allergies.