Correct answer
Carbon dioxide (CO₂).
Carbon dioxide, CO₂. It is not carbon monoxide, CO, another hazardous combustion gas. CO₂ can be dangerous at high concentrations and should not be described as harmless in every amount. Do not inhale exhaust or run an engine in an inadequately ventilated enclosed space.
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Iron oxide, which is not a greenhouse gas from combustion.
Magnesium oxide, which is not a greenhouse gas from combustion.
Carbon dioxide (CO₂).
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