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The ACGIH ( American Conference of Governmental Industrial Hygienists ) increased the TLV*


December 30, 2021 – The ACGIH (American Conference of Governmental Industrial Hygienists) increased the Threshold Limit Values for the amount of 222nm Far UV exposure from 23 mJ/cm² to 161 mJ/cm² for the eyes and 479 mJ/cm² for skin, or an increase of about 7 times and over 20 times, respectively, reflecting the vast amount of data showing that this wavelength of light does not penetrate the most superficial layer of the stratum corneum or tear layer


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