A County-Level Program for the Evaluation of the Potential for Take-Home Lead Exposures Among Children in Michigan

Abstract

Objective: Take-home lead exposure involves lead dust inadvertently carried from the worksite by employees that becomes deposited in their homes and vehicles. We piloted a program in 2 counties in Michigan to investigate the countywide potential for take-home lead exposures across industries. Methods: During 2018-2020, we identified establishments through internet searches and industry-specific registries. We visited establishments with a physical storefront in-person; we attempted to contact the remaining establishments via telephone. We administered questionnaires at the establishment level to assess the presence of lead and the current use of practices meant to mitigate the potential for take-home lead exposures. We recruited workers for wipe sampling of lead dust from their vehicle floors to test for lead levels. Results: We identified 320 establishments with potential lead use or exposures. Questionnaire responses revealed widespread worker exposures to lead and a lack of education and implementation of best practices to prevent lead from leaving the worksite. Dust samples (n = 60) collected from employee vehicles showed a ubiquitous tracking of lead out of the workplace, with a range of 5.7 to 84 000 µg/ft2 and a geometric mean of 234 µg/ft2. Of the sample results, 95.0% were above the lead dust clearance levels for homes established by the US Environmental Protection Agency. Conclusions: This work suggests that take-home lead exposures are widespread and may be important sources of lead exposure among children. It also demonstrates the feasibility of a program for the identification of establishments whose employees may be susceptible to taking lead dust home with them and whose children may subsequently be targeted for blood lead monitoring.