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<p>The previous answer (HL3216) took account of the relevant national and international
guidelines and the relevance of various chemicals to human health. For example, two
of the substances measured (tolulene and carbon monoxide) are the subject of a European
standard for safety, health and comfort limits (BS EN 4618:2009). In addition to this,
for the substances that do not have a European standard, other limits and guidelines
have been considered in assessing the significance of any health risk of exposure
to the concentrations measured in cabin air. Several of the substances monitored during
the research, for example TBP, TOCP and tetrachloroethylene, have workplace exposure
limits (WEL). For substances that do not have a WEL, a number of guidelines were used
that have been recommended by the World Health Organisation as well as different groups
in the UK and EU. These groups include Kotzias et al, Department for Communities and
Local Government (DCLG) and the Committee on the Medical Effect of Air Pollutants
(COMEAP).</p><br />
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