Source: BTS.

Estimated Air Pollutants Emitted by Highway Transportation in the United States, 1970-2008

The most important transport emissions are related to carbon monoxide, Volatile Organic Compounds (VOC) and nitrogen oxides, while transportation plays a marginal role for particulates and sulfur oxides emissions. Due to better engine technology and more stringent standards, the amount of pollutants released has declined substantially. Contributions patterns are fairly consistent among different developed countries, but differences exist. They may be attributed to modal choice, the industrial structure, commercial energy sources and general climatic conditions.

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