A new study from Ph.D. graduate Jacob Ward, Professor Jeremy Michalek of Engineering and Public Policy (EPP) and Mechanical Engineering (MechE), and Associate Professor Costa Samaras of Civil and Environmental Engineering at Carnegie Mellon University quantifies the costs and benefits of taking a trip with a transportation network company (TNC), like Uber or Lyft. They found that a TNC trip actually decreases local air pollution, on average, compared to driving a personal vehicle.
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Source: Phys.org