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VOC concentration (ppb) of specific VOCs measured by the Summa canisters in 10 beauty salons, for VOCs measured according to the US EPA TO-15 method detected in at least one salon. The hazard score was determined by calculating the measured VOC concentration in ppb divided by that VOC’s reference value in ppb and summing that quantity for all measured VOCs in a Summa canister in a salon on a given date, and it is presented in the last row of the figure.
