Fine dust

• Invisible particle less than 10㎛
• Enter the lung while you breathing weaken the immune system

carbon dioxide (CO2)

• Occur when carbon and compoundscombustioncompletely or breathing of creature
• Dry air containing about 0.03%
• It’s non-toxic but as increasing amount of dissolved in blood it remain in the lung and can be dangerous where more than 18%

formaldehyde

• Use a water-soluble gas with strong pungent odor, insecticides, fungicides, synthetic material
• International Center for Research on Cancer classified as "carcinogenic substances concerned '

radon

• Colorless, odorless, tasteless gas since it releases radioactive particles which can have effect on the human body even if the amount is very small, and classified as a carcinogen.

Volatile Organic Compounds

• Organic substance commonly used in everyday life such as liquid fuel, paraffin, olefin are Volatile Organic Compounds, and building materials, cleaning solvent, paint, pesticide are major source
• It absorbed into the body through respiratory and skin ,and it causes difficult breathing, lethargy, headache, vomiting even anemia, blood diseases and disorders
• Typically, toluene, benzene, ethyl benzene, xylene, styrene, etc.