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Lead Lingers: Urban Soil Holds Decades-Old Danger
1 Jul
Summary
- Older urban neighborhoods show high lead levels in soil.
- Lead contamination linked to housing, income, and race.
- Contamination persists for decades even after sources removed.
Decades after leaded gasoline was phased out in the US by 1996, hazardous lead contamination remains prevalent in the soil of older urban neighborhoods. A recent study focusing on Hartford, Connecticut, and Springfield, Massachusetts, found significantly elevated lead levels, particularly near older homes. In some Hartford areas, soil lead concentrations were triple the EPA's safe screening level for child play areas.
The research, published in GeoHealth, combined soil samples with census data, revealing that elevated lead levels clustered near older housing and were influenced by factors such as housing type, property value, and race. The findings suggest a legacy of environmental inequality, with higher contamination found in areas with multi-family housing and a higher proportion of children of color, while neighborhoods with higher property values and more non-Hispanic White residents generally showed lower lead levels.
Lead is a potent neurotoxin, especially dangerous for children whose developing brains are highly vulnerable. Even low-level exposure can lead to developmental issues, including lower IQ and behavioral problems. The study's methodology, utilizing housing and demographic data to identify lead 'hot spots,' can be applied to other cities with similar industrial histories to prioritize testing and remediation efforts. This persistent environmental issue underscores the long-term impact of past industrial pollution and housing policies on public health in urban areas.
