Some more polluted than others: unequal cumulative industrial hazard burdens in the Philadelphia MSA,USA

The aim of this study was to quantify inequities in environmental hazard burdening in the 357 towns and 12 city planning analysis areas in the nine-county Philadelphia Metropolitan Statistical Area. Points were assigned to 14 types of hazards, including Superfund sites, hazardous waste facilities, landfills, trash transfer stations, waste tyres, incinerators, power plants, polluting factories, and sewage and sludge treatment facilities. When points were summed, 39 communities were in the 90th percentile for total hazard points. Risk ratios were calculated for community characteristics. The risk of extensive hazard burdening was significantly greater for communities bordering the Delaware River and for communities with more than 3% minority residents, more vacant housing units, and adults without a high school diploma. Risks were significantly lower for the most affluent communities. Results point to the need to reform environmental laws at the state level to prevent the concentration of environmental hazards in vulnerable communities.