The New ACGIH 222nm UV Exposure TLVs for Human Exposure

The new research proved that 222nm UVC is safe for human skin, but according to the photobiosafety standard IEC/EN 62471, the maximum permissible UVC exposure of 222nm is 22mJ/cm², similar with 254nm. The data wasn’t updated yet.

Recently, ACGIH published the new report of 2022 threshold limit values (TLVs) and biological exposure indices (BEIs). In this report, from page 152 to 162 we can find the new TLVs for UV radiation. Using the corresponding formula and based on an spectral weight coefficient, we can get the TLV for 254nm at 6 mJ/cm², and the TLV for 222nm has been increased from 22mJ/cm² to 478 mJ/cm², in case of skin exposure, and 160mJ/cm² for eye exposure.

The regulation about the photobiosafety standard of 222nm UVC is expected to be updated shortly with the new recommendations of ACGIH.

For the details of ACGIH 2022 threshold limit values (TLVs) and biological exposure indices (BEIs), please check the screenshots and link below.

ACGIH 2022 threshold limit values (TLVs) and biological exposure indices (BEIs)                                            https://www.techstreet.com/standards/2022-threshold-limit-values-tlvs-and-biological-exposure-indices-beis?product_id=2242171#product