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Air Quality in Transit Buses (2023) / Chapter Skim
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Day 1 Session 2
Pages 16-20

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From page 16...
... Air quality improvements in buses need to be approached from a system level that considers the whole bus, not just with a filter or a UV unit. Edwards noted that a 2009 TCRP report, Transit IDEA J-04/IDEA 53: Ultraviolet Germicidal Irradiation for Transit Buses, investigated the use of UV germicidal for transit 16
From page 17...
... The air filters are a critical part of the HVAC system, but higher filtration can also mean less airflow. Another study, which was not specific to transit buses, looked at particulate matter 2.5 -- meaning particle sizes of 2.5 microns and smaller -- as a cumulative measurement used in air quality.
From page 18...
... The researchers also found that if windows were open, the HVAC air conditioning unit would overwork and sometimes freeze up. Edwards summarized that verification testing is important to understand how things work in the real world, especially real-time monitoring of air quality within transit environments.
From page 19...
... There are many potential air cleaning systems, and UV is one that has a more established record of effectiveness in the published literature. This is an example of working with the solutions that are available by selecting control options, including stand-alone filters and air cleaners that provide desired exposure reduction while they minimize associated energy penalties.
From page 20...
... is applicable as a practical manner. DeGraw responded that it would need to be determined that opening the windows was a positive action to take but should be taken in consideration of specific environments and stakeholders, citing the West Coast wildfires and concerns about smoke inhalation for children on school buses.

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