The Answer

APTA ( is the only association in North America that represents all modes of public transportation, including bus, paratransit, light rail, commuter rail, subways, waterborne services, and intercity and high-speed passenger rail. More than 90 percent of the people using public transportation in the United States and Canada ride APTA member systems.


One person riding the bus for a 32 km commute reduces their annual CO2 emissions by 20 pounds per day. How much CO2 would two full HSAT buses save each year? Combined, HSAT buses travel 582,141 km annually!

Hint: Our two buses each carry 20 passengers maximum and run year-round except for Christmas Day, New Year’s Day and Good Friday.


  1. 582,141 km divided by 32 km = to find the number of 32 km trips in a year (i.e. 18,191.906)
  2. Multiply those trips by 20 pounds of CO2 (18,191.91 x 20 = 363,838.2 pounds)
  3. Multiple the result by 20 people on a bus (363,838 people x 20 pounds = 7,276,760 pounds)
  4. Multiple the result by 2 buses (7,276,760 x 2 buses = 14,553,520 pounds of CO2)

The result, 14,553,520 pounds, is the total amount of CO2 emission HSAT buses could potentially save annually from getting into the atmosphere!

Of course the assumption is that each of those 40 people would have otherwise driven their own vehicle for the 32-km round trip.

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