Silicosis

[4] Silicosis, particularly the acute form, is characterized by shortness of breath, cough, fever, and cyanosis (bluish skin).

[6] The name silicosis (from the Latin silex, or flint) was originally used in 1870 by Achille Visconti (1836–1911), prosector in the Ospedale Maggiore of Milan.

The negative effects of milled calcined flint on the lungs of workers had been noted less than 10 years after its introduction as a raw material to the British ceramics industry in 1720.

[11] In the early 21st century, an epidemic of silicosis was caused by the unsafe manufacturing of engineered stone countertops containing quartz (and obsidian), which became popular.

[13] Signs and symptoms include: In advanced cases, the following may also occur: Patients with silicosis are particularly susceptible to tuberculosis (TB) infection—known as silicotuberculosis.

[15] In 1996, the International Agency for Research on Cancer (IARC) reviewed the medical data and classified crystalline silica as "carcinogenic to humans."

"[16] When small silica dust particles are inhaled, they can embed themselves deeply into the tiny alveolar sacs and ducts in the lungs, where oxygen and carbon dioxide gases are exchanged.

In turn, these stimulate fibroblasts to proliferate and produce collagen around the silica particle, thus resulting in fibrosis and the formation of the nodular lesions.

Silicosis is due to deposition of fine respirable dust (less than 10 micrometers in diameter) containing crystalline silicon dioxide in the form of alpha-quartz, cristobalite, or tridymite.

A computed tomography or CT scan can also provide a mode detailed analysis of the lungs, and can reveal cavitation due to concomitant mycobacterial infection.

Classification of silicosis is made according to the disease's severity (including radiographic pattern), onset, and rapidity of progression.

[27] The use of personal protective equipment (PPE) is a measure of last resort when attempting to control exposure to respirable crystalline silica.

[29][30] The Health and Safety Executive in the UK has produced guidelines on controlling exposure to respirable crystalline silica in potteries, and the British Ceramics Federation provide, as a free download, a guidance booklet.

In the United States, a 1930 epidemic of silicosis due to the construction of the Hawk's Nest Tunnel near Gauley Bridge, West Virginia, caused the death of at least 400 workers.

[40] The prevalence of silicosis led some men to grow what is called a miner's mustache, in an attempt to intercept as much dust as possible.

[41] Also, the mining establishment of Delamar Ghost Town, Nevada, was ruined by a dry-mining process that produced a silicosis-causing dust.

Brief or casual exposure to low levels of crystalline silica dust are said to not produce clinically significant lung disease.

[45] In less developed countries where work conditions are poor and respiratory equipment is seldom used, the life expectancy is low (e.g. for silver miners in Potosí, Bolivia, is around 40 years due to silicosis).

Social realist artist Noel Counihan depicted men who worked in industrial mines in Australia in the 1940s dying of silicosis in his series of six prints, 'The miners' (1947 linocuts).

[47] A recent rise of cases in Australia has been associated with the manufacture and installation of engineered stone bench tops in kitchens and bathrooms.

[51] The Australian Government Department of Health established a National Dust Disease Taskforce in response to the number of reported cases of silicosis in 2018.

[53] Silicosis has also been identified as one of many long-term health outcomes for first responders from the terrorist attacks of September 11, 2001, after having been exposed to dust containing high concentrations of respirable crystalline silica, as well as other metals and toxins.

[58] In March 2016, OSHA officially mandated that companies must provide certain safety measures for employees who work with or around silica, in order to prevent silicosis, lung cancer, and other silica-related diseases.

These medical exams are to occur within 30 days of the initial assignment that includes silica exposure and must be made available for renewal at least every three years unless the PLHCP deems otherwise.

As part of the updated standard, OSHA created a table of specific engineering and administrative control methods to reduce silica exposure when using specific tools in 18 different applications that are known to create an exposure to silica from stationary masonry saws to using handheld grinders.

[62] Both standards contained in the final rule took effect on June 23, 2016, after which industries had one to five years to comply with most requirements, based on the following schedule:

A video discussing a field-based approach to silica monitoring. Monitoring could help reduce exposure to silica.
Workers in a cloud of concrete dust containing respirable crystalline silica with no controls in place