>The WEL for Manganese (since 2018) in the UK for those small particles that reach the deep lung (known as respirable particles) is 0.05mg/m3 (8hr TWA), a tenth of the previous WEL.
This change is significant as much of the manganese in the fume will be respirable. It is likely that the respirable limit will be exceeded during many welding activities unless effective controls are introduced and used properly.
https://breathefreely.org.uk/guidance-on-exposure-to-mangene...
>The WEL for Manganese (since 2018) in the UK for those small particles that reach the deep lung (known as respirable particles) is 0.05mg/m3 (8hr TWA), a tenth of the previous WEL.
This change is significant as much of the manganese in the fume will be respirable. It is likely that the respirable limit will be exceeded during many welding activities unless effective controls are introduced and used properly.
https://www.hse.gov.uk/welding/health-risks-welding.htm