Lead (Pb) is an elemental heavy metal and can be directly released into the air as suspended particles. Historic major sources of lead emissions into air are automotives and industrial release.
Elevated levels of lead in environment can results in decreased growth and reproductive rates in plants and animals. Also neurological effects in vertebrates. Lead also causes long term harm in audult invlinclu increased risk of blood pressure and kidney damage.
Overall lead can remain in the environment as dust indefinitely. Lead in the fuels contributes to air pollutions especially in urban areas. Soils near highway and freeway have higher level of lead than soil because of their exposure to more lead accumulation over a period of time.
Overall disel driven automotives also emits lead as the gasoline vehicle and results in more environment pollution.
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