wearing a mask is that it helps prevent you from getting ill and
therefore helps keep you working.Specifically, it helps prevent the development of illnesses
which could affect your airways – which could reduce the quality and length of your life.
Wearing a mask can stop you from developing the symptoms of respiratory illness caused
by inhalation of hazardous substances at work (for example, coughing, wheezing, shortness
of breath, chest tightness or difficulty in breathing).
There were an estimated 12,000 deaths in 2009/10 and another 12,000 deaths in 2010/11
from long-term exposure to respiratory hazards at work