Under the Microscope: Formaldehyde Inhalation Exposure in NHS Pathology Departments

Objectives The US Environmental Protection Agency has determined that formaldehyde presents an ″unreasonable risk of injury to human health″. Occupational exposure studies demonstrate that chronic formaldehyde inhalation is associated with damage to the respiratory, female reproductive, and nervous systems, and is also carcinogenic. The UK long- and short-term work exposure limit (2ppm) is amongst the world′s highest and now diverges significantly from recently improved EU regulation (EU long-term exposure limit: 0.3ppm; EU short-term exposure limit: 0.6ppm). We sought to evaluate the formaldehyde monitoring data of NHS cell pathology departments and compare the extent of inhalation exposure to EU and UK work exposure limits. Methods Using the Freedom of Information Act (2000), we requested 12 months of formaldehyde inhalation exposure monitoring data from n=121 NHS Trusts. Results In total, 1,712,371 formaldehyde inhalation exposure monitoring events were disclosed by n=104 NHS Trusts on behalf of n=117 NHS cell pathology departments. Formaldehyde inhalation exposure is infrequently monitored (once weekly or less at 73% of sites) and EU work exposure limits are regularly breached (95th centile of exposure >0.3ppm at 70% of sites; 95th centile of exposure >0.6ppm at 44% of sites). Over a third (34%) of NHS cell pathology departments had exceeded the UK work exposure limit at least once in the preceding 12 months. Overall, only 11% of NHS cell pathology departments had at least once daily formaldehyde inhalation exposure monitoring demonstrating a 95th centile of exposure lower than the EU long-term work exposure limit. Conclusions Urgent national regulatory intervention is warranted to improve the occupational hygiene of NHS cell pathology departments and protect the health of thousands of NHS employees.