Dust refers to particles of substances that float in the air. It is often generated when burning fossil fuels such as coal and petroleum, or from exhaust gases from factories and automobiles. Dust is classified into total dust (TSP, Total Suspended Particles), which is less than 50μm, and fine dust (PM, Particulate Matter), which has a very small particle size.
Fine dust has very small particles and is divided into PM10, which is general fine dust, and PM2.5, which is also called 'ultrafine dust'. If PM10 is about 1/5~1/7 smaller than the diameter of human hair (50~70μm), PM2.5 is very small, about 1/20~1/30 of the hair. As such, fine dust is so small that it is invisible, so it stays in the air, penetrates through the respiratory tract, penetrates the lungs, etc., or travels through the blood vessels and enters the body, which may adversely affect health.
The World Health Organization(WHO) has proposed air quality guidelines for fine dust (PM10, PM2.5) since 1987, and in 2013, the International Agency for Research on Cancer (IARC) has designated fine dust as Group 1 carcinogens (Group 1) that have been confirmed to be carcinogenic to humans.
The composition of fine dust can be different depending on the region, season, weather conditions, and source. Natural fine dust consists of soil, salt, and plant pollen. Artificial fine dust is fumes, exhaust gas, and flying dust. The problem is mostly artificial fine dust.
In general, the components of artificial fine dust are lumps formed by reacting air pollutants in the air (sulfates, nitrates, etc.), carbons and fumes generated in the process of burning fossil fuels such as coal and petroleum, and minerals from soil dust on the surface. Configured. When looking at the composition ratio of fine dust measured nationwide, sulfate and nitrate are the highest with more than 50%, carbon and soot are less than 20%, and minerals are more than 5%.
Air Purification Effect of Wellis Disinfection Purifier
September 2019 VOC test Laboratory in UNIVERSITAT BARCELONA TECH
Test condition : 225,72m3 total volume chamber
March 2016 VOC test in KCL(Korea Conformity Laboratories)
- Ammonia : Maximum 80%
- Toluene : Maximum 99.5%
- Formaldehdyde : Maximum 65%