SOURCE: Kim et al., 2017, Cahyanto et al., 2016.
While it is still important to cleanse surfaces, scientists believe the coronavirus is borne through air and can infect people when inhaled making air quality the greatest factor in the risk of infection.
Air Purification on Bus and Trains will give passengers the confidence to return to public transportation.
Why Air Purification versus MERV-13 Filters.
Many operators have taken steps to install higher-rated filters that capture smaller particles (the diameter of the SARS-CoV-2 virus has been found to range between 50 nm to 140 nm MERV rating of 13 means the filter is 90% to 98% minimum efficient at capturing particles, sized 30-100 nm), but they are not as effective against COVID-19 for air quality. Further, swapping out one MERV 8 filter for a MERV 13 is a complex proposition.
ISSUE USING MERV-13 FILTERS
Decal for the window of bus and train to instill confidence in riders that it is safe to get onboard.