The rising prevalence of airborne disease and the increasing air pollution levels bring the need for air purifiers. It purifies the air from dust, smoke, odors, volatile organic compounds, gases, viruses, formaldehyde, pollen, and pet dander. Air purifiers are expected to witness significant growth as infectious disease experts warn that coronavirus cases are likely to be prevailing and surging in the coming months. The global air purifier market is expected to reach $28.3Bn by 2027. 
Air Purifier Technology
Air purifiers contain single or multiple filters and a fan that sucks the air. The air is passed through the filters and absorbs the particles from the air, and the clean air is circulated. The most common filters used are high-efficiency particulate air (HEPA), ion & ozone, activated carbon, baghouse filter, cartridge filter, etc. Most devices on the market rely on mechanical filtration to clean the air and are rated by the clean air delivery rate (CADR). Based on the coverage area of the end-user segment, the filters are classified as <300 sq ft for automobiles, filters with coverage between 300 sq ft to 500 sq ft for residential, and >500 sq ft for commercial and industrial spaces.
Purifiers Help with COVID Crisis
HEPA Filters: The Coronavirus, SARS, and influenza A viruses typically die in under 48 hours across various surfaces. These viruses prefer wet materials as they don’t survive well on dry materials. The HEPA filters inside most air purifiers are constantly bombarded with high-velocity air, which would dry out any virus. Technically the virus that causes COVID is approximately 0.125 microns (125 nanometers) in diameter, where HEPA filters can capture them with extraordinary efficiency, almost at 100%. 
Ionizers: Ionizer-based purifiers shoot out negative ions into the air. Those negative ions in the air cause the particles to stick to surfaces in the environment. But, most ionizers are too weak to affect particulate levels (PM 8), whereas the HEPA filters can capture particles from PM2.5 to PM10 and less harmful when compared. One greater disadvantage with the ionizers is that the human intervention on the surfaces could dislodge the particles and float them back to air.
UV Light Kills the COVID Virus
According to an expert study, filters can capture the virus and contain it, and it typically dies after 48 hours on the filters. But, there’s a need for conventional air purifiers to combine the technology that’s effective to kill the virus. One such ongoing upgrade to the purifiers that are happening recently is the addition of UV light. Scientists believe that exposing the virus to UV light can kill the virus. A doze of 75mJ/cm2 of UV-C light can kill over 99.9% of COVID when placed at a distance of 1 meter for 18 mins. Moving the distance closer than 1 meter to 10 cms could drop the disinfection time from 18 minutes to just 11 seconds. 
The pandemic has impacted the air purifier industry positively, raising the interest in hygiene and immunity. The Indian market alone is expected to expand at a robust CAGR of 43.8% from 2020 to 2027. Businesses and key players are taking innovative steps to reopen and put life back to normal – even smarter and safer than before. 
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