The fumes from an cars exhaust contain carbon monoxide. Carbon monoxide is a colorless, odorless, tasteless, toxic gas that will kill you with no warning signs. It may cause headaches, dizziness, and fatigue. With enough exposure you will die. Even with Catalytic converters there is still about 2% CO in the exhaust. There is also Hydrocarbons, Nitrogen, & Sulfur.
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