Silica Awareness: Silicosis has been a recognized disease process for over 400 years.Agricola in his Treatise on Mining, written in 1556 described a pulmonary disease afflicting stonecutters and miners and later by Ramazzini in 1713.Technological advances in the last century, have dramatically increased the dust exposure to the worker due to the high pressure power and air equipment used to in mining, sandblasting and other industrial settings.
- Arsenic poisoning is a medical condition caused by elevated levels of the element arsenic. The dominant basis of arsenic poisoning is from ground water that naturally contains high concentrations of arsenic. A 2007 study found that over 137 million people in more than 70 countries are probably affected by arsenic poisoning of drinking water.
- Carbon Dioxide - OSHA's former limit for carbon dioxide was 5000 ppm as an 8-hour TWA. The ACGIH has a 5000-ppm TLV-TWA with a 30,000-ppm TLV-STEL, and these were the limits proposed. NIOSH has a TWA REL of 10,000 ppm with a 10-minute 30,000-ppm ceiling limit; however, NIOSH (Ex. 8-47, Table N1) concurred that the proposed limits were appropriate. After carefully reviewing the record evidence submitted in response to OSHA's proposal for carbon dioxide, the Agency has determined that exposure limits of 10,000 ppm (8-hour TWA) and 30,000 ppm (15-minute STEL) are appropriate. Carbon dioxide is a colorless, odorless, noncombustible gas.