Local Scale Regional Scale Global Scale
Noise and vibrations Acid rain and acid depositions Climate Change (Carbon dioxide, CFCs)
Carbon monoxide, Odors Ozone layer depletion (CFCs)
Smog, Nitrogen oxides, HC/VOC, Particulates, lead Reduction of fossil fuel reserves
Sulfur dioxide, Ozone
Accidental and intentional releases
De-icing of infrastructure, Runoffs
Marine vessels discharges and spills
Construction and maintenance of infrastructure
Geographical Scales of the Environmental Externalities of Transportation