Research & reports

U.S. Environmental Protection Agency · U.S. Environmental Protection Agency (EPA) · United States

This EPA page (last updated December 22, 2025) explains chromated copper arsenate (CCA), a wood preservative used since the 1940s for utility poles, posts, and other structural lumber. Manufacturers voluntarily ended CCA use for residential wood products in December 2003. EPA notes cancer and non-cancer health risks for workers and environmental risks to aquatic invertebrates and plants, while stating there is no health risk to the general public; removal of existing CCA structures is not mandated, though periodic sealant coating is recommended to reduce leaching.

Gamal El Afandi, Hossam Ismael, Souleymane Fall · Sustainability · United States

Using a hybrid approach combining the HYSPLIT and AgDRIFT models, this study estimated organophosphate pesticide spray drift from corn and soybean fields into urban-agricultural interface communities in Sangamon County, Illinois, at both field and county scales. Preliminary findings indicate that all residential areas near agricultural land are at risk of pesticide drift, since buffer zones do not exceed 25 meters; of 34 water bodies (rivers, lakes, streams, and drains) within the 30,200-acre study region, 12 fall within the high-drift zone, and roughly 106 buildings across an estimated 10,300 km² were found to have potential exposure to drift.

Jonathan Hall, Isabel Shargo, Niya Khanjar, Jianna Howard, Laura Schmidt, Ashley Deng, Camryn Edwards, Isabelle Berman, Joseph Galarraga, Sacoby Wilson · Environmental Justice · United States

This study in Baltimore, Maryland, used GIS mapping and spatial analysis to assess the proximity of urban farms to environmental hazards, including those with heavy metal contamination. Analyses indicated that contamination of urban farms is a possibility due to proximity: more environmental hazards were found in census tracts with urban farms, and low-income communities of color had hazards near urban farms. Historically industrial areas showed a higher concentration of environmental hazards with heavy metal or unknown contamination.

Bethany B. Cutts, Danqi Fang, Kaitlyn Hornik, Jonathan London, Kirsten Schwarz, Mary L. Cadenasso · Environmental Justice · United States (California)

This study introduced a Qualitative Historical Geographic Information System (QHGIS) method to investigate how newspapers reflect changing meanings of place in relation to environmental burden and benefit. Applying QHGIS to urban gardening and soil lead issues reported in Sacramento, California, the method revealed the distribution of public narratives of environmental concern across the city, the politics embedded in location names, place name-changes, and how locations serve as framing devices for environmental concerns.

Brent F. Kim, Melissa N. Poulsen, Jared D. Margulies, Katie L. Dix, Anne Palmer, Keeve E. Nachman · PLoS ONE · United States (Baltimore, Maryland)

This study characterized urban community gardeners' knowledge and perceptions of soil contaminant risks in Baltimore, Maryland, United States, through surveys with 70 gardeners from 15 gardens and interviews with 18 key informants. It found low levels of concern and inconsistent knowledge regarding heavy metal and organic chemical contaminants among gardeners. Furthermore, barriers to investigating garden site history and conducting soil tests, along with limited knowledge of best practices for reducing exposure, were identified.

Samantha Langley-Turnbaugh, David E. Wilkinson, D. Rocque · Soil Survey Horizons · United States

This study characterized urban soils in a low-income neighborhood of Portland, Maine, that was heavily industrialized in the late 1800s, examining seven pedons for particle size, cation exchange capacity (CEC), base saturation, exchangeable bases, pH, and trace elements (Pb, Cr, Cu, Co, Cd, Ni, Zn, Hg, Ti, Zr). The soils contained numerous artifacts and showed a high degree of horizontal and vertical spatial variability; several trace elements were present at elevated levels, with lead (Pb) the dominant metal in surface horizons (600 mg/kg), and many metals correlated with each other and with iron and aluminum, and some with clay content and pH, though the study concludes that mapping soil units by specific trace element ranges would be difficult given the extreme variability observed.