They didn’t sample white or asian hairdressers and then throw out headlines to play the racial angle to feed on inequality outrage and draw in reader when there isn’t even a basis to quantify that this is impacting any particular race disproportionately.

What the article concludes is that black and hispanic hairdressers show to have more chemicals in their system than people of color working in office jobs. It is about profession and not race. The implication that it disproportionately impacting people of color was an unsupported assumption.