fig1

Figure 1. Specific gravity-corrected urinary biomarker concentrations (ng/mL) based on hair services provided in a typical week (n = 23, 2018-2019). The figure compares 2-naphthol and MeP concentrations between hairdressers who provided (“yes”, denoted by blue dots) select chemical-intensive services, hair styling and maintenance services, and natural hair services and those who did not offer these services (“no”, denoted by green dots). MeP: Methylparaben.