When asbestos is disturbed the fibres can be inhaled into the lungs and can cause asbestosis, lung cancer and a particularly aggressive cancer called Mesothelioma. These diseases cause up to 4,000 deaths a year in the UK alone, and is the greatest cause of work-related deaths in the UK.

https://www.skcltd.com/products2/air-sampling-pumps/flite4.html