The main pollutant from automobile exhaust is

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(A) Automobile exhaust contains various gases such as $CO$,$CO_2$,$NO_x$,and unburnt hydrocarbons. Among these,$CO$ (carbon monoxide) is considered th

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$CO$

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(A) Automobile exhaust contains various gases such as $CO$,$CO_2$,$NO_x$,and unburnt hydrocarbons. Among these,$CO$ (carbon monoxide) is considered the most toxic and primary pollutant released from automobile exhaust due to incomplete combustion of fuel. While $CO_2$ is present in large quantities,$CO$ is the most hazardous pollutant in terms of immediate health impact.

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