We know of no cases of occupational asthma to beech that have been confirmed by specific bronchial challenge test but the paper below does show confirmed rhinitis to beech.
Beech tar can also cause occupational asthma. Creosote (often made from beech) is corrosive and can cause damage to the lungs and is an irritant to mucous membranes.
The Oasys Audit scheme started midway through 2010 and collects agents typed in through the Oasys program. The years before 2010 show old data entered during 2010 or later and are likely to have many fewer notifications. We expect Oasys to become more widely adopted as time goes by so increasing notifications does not necessarily mean an increasing problem.