Air Quality Guidelines Global Update 2005 - World Health ...

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AIR QUALITY GUIDELINES
and are measured as number concentration. While there is considerable toxicological
evidence of potential detrimental effects of ultrafine particles on human
health, the existing body of epidemiological evidence is insufficient to reach a
conclusion on the exposure–response relationship to ultrafine particles. Therefore
no recommendations can be provided at present as to guideline concentrations
of ultrafine particles.
References
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