Most hazardous metal pollutant of automobile exhausts is
Lead emitted from the vehicular exhausts is a harmful pollutant because it persists in the environment as dust for an indefinite time period. It is a major air pollutant in urban areas. Anaemia, weakness, kidney failure, neurological disorders are the symptoms of lead poisoning in humans. Children are more prone to lead poisoning than adults. Hence, the correct answer is 'Lead'.