Table 1

Categories of exposure on the exposure axis of the job exposure matrix

Low risk:
 Unlikely to be exposed to substances associated with risk of asthma or to other irritating chemicals
 Possible exposure to other substances (not typically associated with asthma):
  Low level exposure to chemicals which may or may not be sensitisers
  Exposure to irritants, but not high peaks (in construction, mining, etc)
  Exposure to exhaust fumes and environmental tobacco smoke
High risk:
 Jobs with a moderate or high probability of exposure to agents associated with occupational asthma:
 High MW agents:
  Derived from animals:
   Rodents, livestock
   Fish, shellfish
  Arthropods or mites
  Derived from plants:
   Other, miscellaneous
  Bioaerosols (moulds, endotoxins, etc)
  Biological enzymes
 Low MW agents:
  Highly reactive chemicals (cross linking agents)—(anhydrides, amines, reactive dyes, glues, biocides, others, etc)
  Sensitising drugs
  Industrial cleaning agents
  Wood dusts, sensitising
  Metal sensitisers
 Mixed environments or agents:
  Jobs with high probability of exposure to components associated with metal working fluids
  Jobs in agriculture with high probability of exposure to organic particulate or fumes
  Textile industry production jobs
  Jobs with moderate to high probability of accidental or periodic exposure to very high levels of irritant gases or fumes   (peak exposures)
Individual re-evaluation required:
 Imprecise exposure estimation according to the job code: requires further verification by an expert after taking into  account actual job title or industry sector