More than 300 workplace substances have been identified as possible causes of occupational asthma. These substances include:
- Animal substances, such as proteins found in dander, hair, scales, fur, saliva and body wastes.
- Chemicals, such as anhydrides, diisocyanates and acids used to make paints, varnishes, adhesives, laminates and soldering resin. Other examples include chemicals used to make insulation, packaging materials, and foam mattresses and upholstery.
- Enzymes used in detergents and flour conditioners.
- Metals, particularly platinum, chromium and nickel sulfate.
- Plant substances, including proteins found in natural rubber latex, flour, cereals, cotton, flax, hemp, rye, wheat and papain, a digestive enzyme derived from papaya.
- Respiratory irritants, such as chlorine gas, sulfur dioxide and smoke.
Asthma symptoms start when your lungs become irritated (inflamed). Inflammation causes several reactions that restrict the airways, making breathing difficult. With occupational asthma, lung inflammation may be triggered by either an allergic response to a substance, which usually develops over time, or a lung irritation caused by an inhaled substance, such as chlorine, which may affect you immediately.
Jun. 12, 2014
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