Motor vehicle emissions are the primary source of the dangerous, odorless, colorless gas known as

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Motor vehicle emissions are the primary source of carbon monoxide, which is a dangerous, odorless, colorless gas that can cause health problems such as headaches, dizziness, and nausea. Nitrogen dioxide, carbon dioxide, and sulfur dioxide are also emitted from vehicles, but they are not considered as dangerous as carbon monoxide.

Motor Vehicle Emissions Are the Primary Source of the Dangerous