Absolute certainty would only come from analytical analysis of on-task monitoring, requiring the services of a UKAS accredited analytical lab & analyst. In practical terms, strict compliance with the requirements of the asbestos task manual, consolidated via appropriate CAR Reg 10 training, will usually ensure compliance with these limits. For what it's worth, my own employer has chosen to inform our own (limited range) "Task Manual" Risk Assessments by appropriate competent analysis. The results have repeatedly been determined as below detectable limits. CAR2012 does of course introduce a few shades of grey (or should that be blue or brown), and some of the more tricky tasks in the Task Manual may fall within the NNLW category, with an increasing justification for analytical analysis. Paradoxically, wet stripping of textured coatings now falls within the NNLW category (due to strict interpretation of Parent Directive wording) - when the chance of respirable fibre release is essentially zero!

My interpretation is to refer to the asbestos essentials task sheet for the activity you wish to carry out, most state "The sheet covers the points you need to follow to reduce exposure to an adequate level." If you are following all the controls and methodologies in the AE task sheet you could argue you are unlikely to be exceeding these limits. Assuming an "adequate level" is equivalent to sporadic / low intensity. But, in order to be able to prove this, you would need the services of an UKAS approved lab as mentioned above. Des