THOUGHT LEADER In Pursuit of Clean School Bus Air Written By Dan Fillenwarth S
chool buses are the most densely populated ar- eas of a school facility and they inherently have poor air quality. As previously reported, funding is available through the Coronavirus Aid, Relief,
and Economic Security (CARES) Act and the Consolidat- ed Appropriations Act of 2021 to clean the air in school buses. Additional funding is included in the American Rescue Plan. The options available for cleaning the air on your school buses can be overwhelming. There are so many terms to consider: cubic feet per minute (CFM), clean air delivery rate (CADR), ultraviolet C light (UVC), etc. How do you determine what is best for your fleet? First: Whichever solution you choose, you’re going to
be questioned by the public that you serve. So, keep that in consideration if you are going to choose a technology that isn’t recommended by the Centers for Disease Con- trol and Prevention. The CDC recommends improving
particulate filtration and using UVC, any other technol- ogies are considered “emerging technology without an established body of evidence.” As the American Society of Heating Refrigeration and
Air Conditioning Engineers recently pointed out, emerg- ing technologies such as ionizers, UV-PCO, and others claim to remove or destroy multiple types of contaminants. But in doing so, they may convert them to other harmful compounds. If a technology claims to kill or inactivate SARS-CoV-2
cells, make sure you can explain how the system is still completely safe for students and drivers. If it’s not “safe” for virus cells, is it safe for human cells? If you can’t ex- plain it, choose something else. Second: To help consumers compare the effectiveness
of various air cleaning solutions, the CDC references the EPA’s Guide to Air Cleaners in the Home. In that guide, “efficiency” and “effectiveness” are defined by the term
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