Thread by @ARISense_AQ

#AAAR2022 Improvement of Air Quality in Vehicles – Simulation of Two Different Use Cases of HEPA Filtration. Matisse Lesage, David Chalet, Jérôme Migaud, Christoph Krautner, SHIKHAR ARORA, Nilesh Tharval, Martin Lehmann, MANN+HUMMEL GmbH

Ultrafine particles matter a lot. In number. 90% of the number conc. 10% of the mass (they are not heavy). But they follow gas streamlines into your body - direct route to the deepest, dearest parts of your body. You don't want this. Lots of unknowns how terrible this..

UFPs can be solved w. improved filtration in the car cabin. Cabin air filters. We manufacturer filters. Bunch of fancy filters.

Multi-filtration concept. Ambient filter (get rid of PM2.5 and harmful gases). Secondary function of this filter is to increase lifetime of the HEPA by catching the dust.

Different filters for different purposes (sizes). Anti-allergen stuff too..

Right now most cars only have an interior filter. HVAC filter. Think Merv 13.

50,000 p/cc UFPs in cabin. Fresh air mode = lots of particles.

Recirculation: Lots of CO2 in the vehicle, but lower overall particle concentration.

3-filter mode somehow can get you the best of both worlds - adding a fresh-air (filtered) mode on top of the standard..

recirculated mode. This would keep CO2 low and particles low and all that other outdoor air pollution exhaust emissions out of the cabin...

I think that's what he's saying.. but honestly - he's going VERY fast.