Which element pollutes the air of a city having large number of automobiles

Which among the following elements pollutes the air of a city having large number of automobiles?

Answer: Lead

Tetra Ethyl Lead (TEL) (CH₃CH₂)4 Pb is used as an antiknock agent. It is mixed with petrol to improve its quality. Therefore automobile exhausts lead, which pollutes city.

An antiknock agent is an additive used to reduce engine knocking and increase the fuel’s octane rating by raising the temperature and pressure at which auto-ignition occurs.

India adopted a fuel upgradation programme in the early 1990s. Low lead gasoline (petrol) was introduced in 1994 in Delhi, Mumbai, Kolkata and Chennai. On February 1, 2000, unleaded gasoline was mandated nationwide.

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