Occupational asthma is asthma caused by, or worsened by, exposure to substances in the workplace. These substances may cause asthma in one of 3 ways:
An allergic reaction (like people with allergies who develop allergic asthma)
An irritant reaction (like a person that reacts to smoking with asthma)
A reaction which results in chemicals that occur naturally in the body, building up in the lung and resulting in an asthma attack
Examples of occupational asthma -- also called work-related...