Cars, planes, trains: where do CO2 emissions from transport come from? - Our World in Data
African cities turn to 'green' buses in fight against pollution
Maricopa Air on Twitter: "#CommitToOneDay and help reduce air pollution by driving less. The Travel Reduction Program at MCAQD encourages residents to use alternative modes of transportation to help reduce air pollution.
Pollution Facts & Types of Pollution | Live Science
Several Virginia districts receive federal funds to replace diesel buses with less-polluting vehicles | American School & University
Urban and transport planning pathways to carbon neutral, liveable and healthy cities; A review of the current evidence - ScienceDirect
10 Possible Transportation Pollution Solutions | HowStuffWorks
Traffic, cars, bicycles and the limits of common sense