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How Much Air Pollution Comes From Cars? - Treehugger
Greenhouse Gas Emissions from a Typical Passenger Vehicle
Vehicles, Air Pollution & Human Health - Union of Concerned Scientists
The environmental impacts of cars, explained - National Geographic
How Much Air Pollution Comes From Cars? | HowStuffWorks
Effects Of Car Pollutants On The Environment - Sciencing
Carbon Pollution from Transportation | US EPA - U.S.
Cars, Trucks, Buses and Air Pollution - Union of Concerned Scientists
What You Can Do to Reduce Pollution from Vehicles and Engines
Vehicle Emissions | Idaho Department of Environmental Quality