(A) Lead $(Pb)$ is a well-known environmental pollutant found in the exhaust fumes of vehicles,particularly those using leaded petrol. Although the us

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(A) Lead $(Pb)$ is a well-known environmental pollutant found in the exhaust fumes of vehicles,particularly those using leaded petrol. Although the use of leaded petrol has been phased out in many countries,lead particles emitted from older vehicles or industrial sources remain a significant environmental concern.