hi All, i have a member of staff who has raised an issue with dust in his working environment (storage warehouse) allegedly this is affecting his asthma. and i'm trying to find some guidance on acceptable levels so i can make a call on his reasonable adjustments if necessary.

many thanks
Jerry

Dust at 10mg/m3 is determined to be a irritant hazard to any non susceptable individual, perhaps as this individual has a pre existing medical condition you may want to aim a little lower than this.

Look at controlling the source of the dust, how it is made or kept airbourne, methods of removal, supression or extraction, aim to reduce this as low as reasonably practical if possible.

Respirable dust has a lower exposure limit than this (the difference being the aforemention particle size), but speaking frankly exceeding the exposure limits of non-hazardous dusts, respirable or inhalable, requires the workplace to be more than a bit dusty.

Another thing to consider would be, are you sure that the dust is the cause of his complaint, although it may seem a likley culprit, it may not be the only one cause, work load for instance or a range of possible work place asthmagens