Exposure is common for people working in tunneling, quarrying, construction, sandblasting, roadway repair, mining, and foundry work. Silo-fillers disease
Silo-fillers disease (not to be confused with farmers lung associated with inhalation of biologic dusts) results from inhalation of nitrogen dioxide (NO2) gas from fresh silage. The presentation is variable depending on level of exposure. Often the gas penetrates throughout the lung and if severe can manifest as a form of acute respiratory distress syndrome, such as significant pulmonary edema, hyalinized alveolar membranes, congestion and other respiratory illnesses. Tobacco smoke
Tobacco smoke is a known carcinogen. Workers in the hospitality industry may be exposed to tobacco smoke in the workplace, especially in environments like casinos and bars/restaurants. Infectious exposure
Influenza
Health care professionals are at risk of occupational influenza exposure; during a pandemic influenza, anyone in a close environment is at risk, including those in an office environment. Tuberculosis
Tuberculosis is a lung disease endemic in many parts of the world. Health care professionals and prison guards are at high risk for occupational exposure to tuberculosis, since they work with populations with high rates of the disease. Others
World Trade Center lung
World Trade Center lung is a cluster of diseases caused by exposure to fallout at Ground Zero of the September 11 attacks in 2001. These diseases include asthma, asthmatic bronchitis, terminal airways disease, sarcoidosis, and acute eosinophilic pneumonia. Examples
Pneumoconiosis
Asbestosis
Baritosis
Bauxite fibrosis
Berylliosis
Caplans syndrome
Chalicosis
Coalworkers pneumoconiosis (black lung)
Siderosis
Silicosis
Byssinosis
Hypersensitivity pneumonitis
Bagassosis
Bird fanciers lung
Farmers lung


== References ==
Post-nasal drip (PND), also known as upper airway cough syndrome (UACS), occurs when excessive mucus is produced by the nasal mucosa. The excess mucus accumulates in the back of the nose, and eventually in the throat once it drips down the back of the throat. It can be caused by rhinitis, sinusitis, gastroesophageal reflux disease (GERD), or by a disorder of swallowing (such as an esophageal motility disorder). Other causes can be allergy, cold, flu, and side effects from medications. However, some researchers argue that the flow of mucus down the back of the throat from the nasal cavity is a normal physiologic process that occurs in all healthy individuals. Some researchers challenge post-nasal drip as a syndrome and instead view it as a symptom, also taking into account variation across different societies. Furthermore, this rebuttal is reinforced because of the lack of an accepted definition, pathologic tissue changes, and available biochemical tests. Signs and symptoms
PND may present itself through the constant presence of discomfort in the upper airways. It is classically described as the sensation of a substance "dripping down the throat" and may also present with rhinorrhea, constant throat clearing, and cough, although its symptoms can be very nonspecific. PND is one of the most common etiologies for chronic cough, defined as a cough persisting beyond 8 weeks.GERD is often associated with a high prevalence of upper-respiratory symptoms similar to those of PND, such as coughing, throat clearing, hoarseness and change in voice.