Abstract This study assesses the impact of the 0.3f/ml BOELV for aluminosilicate wools/refractory ceramic fibres (ASW/RCF), as implemented in 2020, on exposure levels at industrial sites. Now in its 26th year, CARE/PSP is the European programme collecting representative data for occupational exposure to airborne fibrous dust. With the changing regulatory landscape, CARE participants conducted a review of the data, focusing on evidence of reduced exposure or changed industrial practices since 2017 when the BOELV was first introduced. The data was split pre- and post- 2017 and also compared to alkaline earth silicate wool (AES/LBP) which is not classified and thus not covered by the BOELV, to consider the impact on exposure. An independent third-party statistician extracted the relevant data for this study. There are significant differences in workplace exposure among functional job categories (FJCs), since the introduction of the BOELV there has been a reduction in exposure, greater use of alternative AES/LBP and move to increased use of respiratory protective equipment (RPE) across all FJCs where ASW/RCF is being used. The data review for the period 2017-2021 has demonstrated an overall reduction in fibre exposure at both manufacturers and users’ facilities. The introduction of the BOELV for ASW/RCF has led to a greater awareness of the need to control fibrous dust. An increased uptake in the use of RPE and the use of RPE with higher protection factor is observed. There also appeared to be a move to alternative non-classified HTIW where appropriate.