Alliance for Pandemic Preparedness

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Tag: air purification

June 8, 2021

Portable HEPA Purifiers to Eliminate Airborne SARS-CoV-2: A Systematic Review

A systematic review of 11 studies found that portable HEPA purifiers were able to significantly reduce airborne SARS-CoV-2-surrogate particles. Experimental parameters varied considerably, including room sizes varying from 14.75 to 108 m3, and surrogate particle size from 0.012um to <1mm. Overall, HEPA filter-based personal air cleaners were overall the most efficient in removing surrogate particles…

May 4, 2021

Are the Portable Air Cleaners (PAC) Really Effective to Terminate Airborne SARS-CoV-2?

Air sampling in residential rooms of COVID-19 patients (n=7) in Spain showed that 100% of samples were positive for SARS-CoV-2 RNA (cycle threshold (Ct) cutoff 41), but only 15% (1 of 7) of samples were positive after installation of a portable air cleaner (PAC) with a HEPA filter. Notably, the one positive sample after installation…

October 6, 2020

Testing Mobile Air Purifiers in a School Classroom Reducing the Airborne Transmission Risk for SARS-CoV-2

[Pre-print, not peer reviewed] Four mobile air purifiers with HEPA filters in a regular high school classroom were able to reduce the concentration of aerosols by more than 90% within less than 30 minutes compared to a neighboring classroom without purifiers. The authors further estimate that the inhaled dose via airborne transmission from staying in…