Some of the most common environments that require respiratory protection are:
- Hydrogen Sulfide (H2S)
- Sulfur Dioxide
- Carbon Monoxide
- Hydrocarbons - methane, ethane, propane, butane
- Iron sulfide
- Asbestos - Carcinogen
- Ammonia
- Silica - Carcinogen
- Other mineral dusts
- Naturally Occurring Radioactive Materials (NORM) - Carcinogen