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In light of the current Covid situation as well as the coming dry months with the haze coming, I recently had to do a presentation on this, so I figured I should the info here for all to benefit and also share, and others can contribute, discuss etc. 1 Firstly, I have no financial interest in the items I share.. 2 Second, what's an Air Purifier? An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. 3 What are the common contaminants? Before Covid, we had the Haze, and the keyword is PM 2.5 https://www.health.ny.gov/environmental/indoors/air/pmq_a.htm These are particulate matter 2.5 (PM2.5), refers to tiny particles or droplets in the air that are two and one half microns or less in width. Exposure to fine particles can also affect lung function and worsen medical conditions such as asthma and heart disease. Scientific studies have linked increases in daily PM2.5 exposure with increased respiratory and cardiovascular hospital admissions, emergency department visits and deaths. Then biological contaminants, which include bacteria, viruses and others like fungal spores. 4 So now the hot item is the Covid virus, which requires some of the finest filters known to man: BUT I want to emphasise, the key thing for Covid and general health especially for airborne / aerosol based infections, is the MASK. So before you rush out to buy that purifier, buy and wear that mask! And do your social distancing!

HEPA filter are more expensive than the normal filter.. .does the additional cost for HEPA worth it ?

Just got my hands on this particle counter for some data collection. After I was done, decided to do a little test on my own. Heared of this HEPA filter before? Well, I tried it with the aircon full blast. See what's the result.