Dust refers to particles of substances that float in the air. It is often generated when burning fossil 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 500 um , 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 (50-70 um) , PM 2.5 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 (Group1) that have been confirmed to be carcinogenic to humans.
The composition of fine dust can be different depending on the region , seasons , 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 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 UNIVERSITY BARCELONA TECH
Test Condition : 225,72 m3 total Volume Chamber.
March 2016 VOC test in KCL (Korea Conformity Laboratories)
– Ammonia : Maximum 80%
– Toluene : Maximum 99.5%
– Formaldehdyde ; Maximum 65%