Flying mermaid
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I have just bought a hospital grade purifier for Ms FM - an IQAir Healthpro 250.The only way to reduce PM2.5 is to use HEPA (high efficiency particulate air) filters - these are medical grades used in hospitals.
IQAir HealthPro 250 NE - Free Delivery | Air Cleaners Australia
The HealthPro 250 is IQAir's best selling room air purifier worldwide. It combines four advanced filtration technologies to effectively remove a great variety of both particulate and molecular air pollutants
aircleanersaus.com.au
There are quite a few HEPA purifiers now - even Dysons, but this seemed a really good one and I could get it.