**5. Occupational respiratory disorders**

Occupational respiratory disorders are defined as any disorder which affects the respiratory system by long-term inhalation of chemicals, proteins, and dust. Occupational respiratory disorders might happen due to the inhalation of the following substances fumes from metals, smoke from burning organic materials, sprays of varnishes, paint, acids, and pesticides, dust from cotton, silica, coal, drug powders and pesticides and gases from industries. The type of occupational respiratory disorder depends on the environment to which the person is exposed: people, particularly those with other lung disorders, are at risk when they are exposed to air pollution in the environment or to contaminants in indoor environments. Some many more people are at risk of occupational asthma as a result of exposure in the workplace. Exposure to asbestos can cause asbestosis, mesothelioma, and asbestosrelated pleural disease. People who work with beryllium, such as aerospace workers, are at risk of beryllium disease. Byssinosis is prevalent among people who work with cotton, flax, or hemp. Coal workers and graphite workers are at risk of coal workers' pneumoconiosis. Prolonged exposure to silica would result in silicosis [5].
