This patient presented with features suggestive of
chronic airflow obstruction; he had a chronic cough
and progressive dyspnoea and airways obstruction
JCobalt that was unresponsive to inhaled salbutamol. Serial
dust measurements of peak flow at work initially failed to
show any acute reactions to work; there were, however,
slightly lower mean daily peak flow readings
on workdays compared with restdays (fig 1). This is
often seen in workers with the more severe f