Discussion
Motor vehicle emission consists of :
Answer: B
Motor vehicle emissions include carbon monoxide.
Petrol and diesel engines emit carbon monoxide from incomplete combustion, along with hydrocarbons, oxides of nitrogen, particulate matter and carbon dioxide. Carbon monoxide is the largest pollutant by mass from petrol vehicles, which is why it is a core parameter in emission norms and urban air monitoring.
BOD is a measure of organic pollution in water, not an air emission. Hydrogen fluoride comes mainly from aluminium smelters, brick kilns and phosphate fertiliser plants. Calcium is not a vehicle exhaust pollutant.
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