What are the primary sources of lead exposure in humans?
Nationally, the primary source of lead exposure is lead paint. The two primary lead exposure routes for humans are inhalation and ingestion. Lead from airborne sources has been reduced since the phase out and elimination of lead additives in gasoline. Lead is also found in urban areas with older homes containing leaded paint which is also a source of soil contamination. Once lead enters the soil it adheres to the soil particles. Soil containing lead may also be blown by the wind, exposing people to lead containing dust. Movement of lead into groundwater is unlikely unless the water is acidic; a common situation in acid mine drainage areas. Sources of lead in surface water or sediment include deposits of lead-containing dust from the atmosphere, waste water from industries that handle lead (iron and steel and lead producers), urban runoff, and mining piles. Foods such as fruits, vegetables, meats, grains, seafood, soft drinks, and wine may contain lead. Cigarette smoke also contains sma
