Question to the Department for Work and Pensions:

To ask the Secretary of State for Work and Pensions, what assessment the Government has made of the safe levels of acetaldehyde to which workers in the chemical industry can be exposed.

The Health and Safety Executive (HSE) has no plans to commission an assessment of the levels of acetaldehyde that workers are exposed to in the UK chemical industry.

Acetaldehyde has been assigned a Workplace Exposure Limit (WEL). WELs are concentrations of hazardous substances in the air, averaged over a specified period of time, referred to as a time-weighted average (TWA). Two time periods are used; long-term (8 hours) and short-term (15 minutes). For acetaldehyde these are concentrations of 37 milligrams per cubic meter (mg.m^-3) and 92mg.m^-3 respectively.

Substances that have been assigned a WEL are subject to the requirements of the Control of Substances Hazardous to Health Regulations (COSHH). COSHH requires employers to prevent or control exposure to hazardous substances. Under COSHH, control is defined as adequate only if a) the principles of good control practice are applied; b) any WEL is not exceeded; and c) exposure to asthmagens, carcinogens and mutagens are reduced as low as is reasonably practicable. As part of the assessment required under regulation 6 of COSHH, employers should determine their own working practices and in-house standards for control of exposure.