(B) In modern times,the combustion of fossil fuels in $vehicles$ is the primary source of air pollution. Emissions from $vehicles$ release significant

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(B) In modern times,the combustion of fossil fuels in $vehicles$ is the primary source of air pollution. Emissions from $vehicles$ release significant amounts of $CO$,$NO_x$,$SO_2$,and particulate matter into the atmosphere,making them the most significant contributor to urban air pollution.