Which of the following atmospheric pollutants is NOT produced by the exhaust of motor vehicle in Delhi?

The atmospheric pollutant that is NOT produced by the exhaust of motor vehicles in Delhi is Flyash.
Fly ash, flue ash, coal ash is a coal combustion product that is composed of the particulates that are driven out of coal-fired boilers together with the flue gases.
Fly ash produced from coal combustion was simply entrained in flue gases and dispersed into the atmosphere. This created environmental and health concerns that prompted laws in heavily industrialized countries that have reduced fly ash emissions to less than 1% of ash produced.