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Occup Environ Med 59:523-531 doi:10.1136/oem.59.8.523
  • Original article

Assessment of the exposure of islanders to ash from the Soufriere Hills volcano, Montserrat, British West Indies

Table 1

Occupational and environmental exposure limits7–9

Workplace* Workplace/5 Environmental
*These standards are time weighted averages over 8 hours, and assume a 40 hour working week.
†These limits apply to the ISO convention for respirable dust; the limits that applied using the BMRC convention were 5000 μg/m3for respirable dust and 400 μg/m3for silica.
‡Department for the Environment, Transport and the Regions Expert Panel on Air Quality Standards.
Respirable dust
    HSE† 4000 μg/m3 800 μg/m3 50 μg/m3
    EPAQS‡(PM10)
Crystalline silica
    HSE† 300 μg/m3 80 μg/m3 80 μg/m3
    ACGIH cristobalite 50 μg/m3 10 μg/m3 10 μg/m3
    ACGIH quartz 100 μg/m3

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