Trane Technologies’ Thermo King brand has launched a new graphene-based air purification solution for buses that continuously purifies the air while the bus is in operation.

Thermo King says its Air Purification Solution has been independently tested and proven to be 98 percent effective in deactivating certain viruses, including a surrogate for the virus that causes COVID-19.

Thermo King’s exclusive Air Purification Solution is integrated in the bus heating, ventilation and air conditioning (HVAC) unit. The solution leverages a filter, paired with a cleaning technology, to capture and deactivate certain viruses like the virus that causes COVID-19, bacteria and volatile organic compounds as the air is exchanged. It was reportedly tested extensively by an independent laboratory following guidelines of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) and the Centers for Disease Control and Prevention (CDC).

“Our public transit customers understand that riders may feel apprehensive about getting back into their normal routines and taking public transportation,” said Karin De Bondt, president of Thermo King Americas. “Customers and consumers face a wide range of claims in the market regarding air purification. We offer a proven solution, tested and validated by third party experts, that provides safer, healthier air quality for drivers and passengers while in transit.”

“Public bus transit is a major driver of economic stability in cities across the U.S., with millions of people who rely on it every day,” said De Bondt. “As passengers feel confident about resuming public transport, they will have greater access to jobs and schools, supporting economic mobility across socio-economic groups. Resumption of public transport also lowers the carbon footprint, supporting more sustainable cities.”

Thermo King’s Air Purification Solution:



  • Leverages a graphene-enhanced photocatalytic oxidation (GPCO) device coupled with a pre-filter.
  • The pre-filter collects particulate matter while the GPCO device produces oxidants that deactivate various pathogens as the air passes through.
  • Graphene’s properties enhance the performance and safety of the solution beyond what was possible with previous-generation photocatalytic oxidation products.
  • The solution allows operation while passengers are present and does not emit harmful byproducts such as ozone and removes harmful VOCs such as formaldehyde.
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