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Option 3 : Only ii is correct
BS-IV engines is designed in such a way that Sulphur content of the fuel they use be less than 50 part per million (ppm) whereas BS-III run on 350 ppm fuel. The BS-4 complaint vehicles release less pollutants such as carbon mono-oxide, hydrocarbon, oxides of nitrogen and particulate matter compared to BS 3 complaint vehicles.
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