From the article, there doesn't seem to be much of a conclusion rather than more studies are needed, since the technology is poorly understood. And I agree, the

From the article, there doesn't seem to be much of a conclusion rather than more studies are needed, since the technology is poorly understood. And I agree, the idea is that ionization happens naturally, it does, especially after lightning strikes, which then pulls particles downwards to the ground and nearby objects, the same happens indoor. This is good, particles <2.5ppm are attached to objects and usually stay attached and can be removed by wiping, the article you linked to targets gasses and their reactions to ionization in industrial ionizers which is the poorly understood parts. The article also doesn't compare home HEPA efficiency vs home Ionization, so it's not clear which is better or worse. Most modern air pumps also use ionization to clean the air, mainly using plasma (since it's the fastest), so ionization is already widely used in homes. The problem with HEPA filters are the destruction of resources to make them, the bad controls of their quality and their short lifespan (Cheap home HEPA filter needs exchanging every 3 months) and their high price (>30€).