<< Back to Research Summaries
COVID-19 Pandemic May Have Altered Exposures to Environmental Chemicals, ECHO Study Finds
Authors: Megan Romano, et al.
Who sponsored this study?
The Environmental influences on Child Health Outcomes (ECHO) Program at the National Institutes of Health supported this research.
Why was this study needed?
The COVID-19 pandemic caused unprecedented disruptions in the daily lives of children and families worldwide. In the United States, recommendations to stay home and wear masks may have altered people's exposure to various potential endocrine-disrupting chemicals (EDCs). For example, changes in the use of certain consumer products, such as N-95 masks, and decreased exposure to air pollutants due to lockdown may have influenced these exposures. ECHO researchers wanted to learn whether exposures during pregnancy changed during the COVID-19 pandemic.
What were the study results?
During the COVID-19 pandemic, urinary levels of certain chemicals changed, reflecting shifts in exposure. Levels of specific polycyclic aromatic hydrocarbons (PAHs), which are air pollutants from car exhaust, fire smoke, and some grilled foods, decreased. Some synthetic phenols, used in plastics and disinfectants found in household cleaners and consumer products like mouthwashes, also showed a decline. However, levels increased of certain organophosphate esters (OPEs)—chemicals used in plastics, flame retardants, and cleaning agents, and more recently in surgical, KN95, and N95 masks. - The increase in these chemicals may be linked to the use of face masks during the pandemic. When people wore masks regularly, they may have unknowingly inhaled small amounts of these chemicals, leading to higher levels in their bodies. In contrast, urinary concentrations of chemicals commonly found in plastics, personal care products, and pesticides remained largely unchanged.
What was this study's impact?
The study highlighted how significant behavioral changes during the pandemic may have contributed to changes in exposures to harmful environmental chemicals.
Who was involved?
The study included 47 participants from three ECHO Cohort Study Sites who contributed urine samples before and during the COVID-19 pandemic.
What happened during the study?
Researchers collected urine samples from participants before (between October 2018 and February 2020) and during (between March 2020 and April 2021) the COVID-19 pandemic. They tested the samples for various chemicals.
Footnote: Results reported here are for a single study. Other or future studies may provide new information or different results. You should not make changes to your health without first consulting your healthcare professional.
What happens next?
Researchers could continue tracking changes in chemical exposures and their potential health effects to better understand how these environmental exposures change over time, particularly during significant societal changes like the COVID-19 pandemic.
Where can I learn more?
Access the full journal article, titled “Changes in urinary concentrations of contemporary and emerging chemicals in commerce during the COVID-19 pandemic: Insights from the Environmental influences on Child Health Outcomes (ECHO) program,” in PLoS One.
The content is the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health
Published January 24, 2025




Collaborative ECHO Cohort research led by Phillip Sherlock, PhD; Maxwell Mansolf, PhD; and Courtney Blackwell, PhD of Northwestern University investigates the COVID-19 pandemic’s impacts on adolescents’ mental health. The findings suggest that some teens with a history of depression, anxiety, autism and ADHD experienced more severe impacts than those without. This research, titled “Life Satisfaction for Adolescents with Developmental and Behavioral Disabilities during the COVID-19 Pandemic,” is published in