At present, PM2 is included in Taiwan's air quality indicators..5, PM10, ozone (O3), sulfur dioxide (SO2), nitrogen dioxide (NO2) and carbon monoxide (CO).
At present, the most frequently exceeded pollutant in Taiwan is PM2.5, followed by ozone.

What is the difference between PM2.5 and PM10?
Suspended particles with a diameter of less than or equal to 10 microns (µm) are PM2.5, and those with a diameter of less than or equal to 2.5 microns are called fine suspended particles (PM2.5). Suspended particles (PM) can stay in the atmosphere for a long time. Because PM2.5 is smaller, it can stay in the atmosphere longer than PM10 and can travel farther. It is also easy to absorb toxic substances such as heavy metals and dioxins in the air. Not only Dirty, very poisonous, and can enter the body with breathing, accumulate in the trachea or lungs, and circulate to the whole body with blood, affecting respiratory and cardiovascular and other organs and systems, causing asthma, lung cancer, lung adenocarcinoma, high blood pressure, stroke and other diseases.

Sulfur oxides - Combustion Coal Petroleum and other oily fuels Petroleum refining Metal smelting Papermaking
Aerosols - Fuel Combustion Industry Construction Forest Fire Waste Incineration Vehicle
Nitrogen oxides - Nitrogen oxides in the air under high temperature combustion, car engines, power plants, or emissions from fertilizer manufacturing processes
Volatile Organic Compounds (Hydrocarbons) - Businesses or households using solvents in vehicles
Carbon Monoxide Fuel Combustion - Gasoline

These outdoor air pollution will enter the room through natural ventilation, air-conditioning and air-conditioning exchange, etc., and circulate around our indoor space. In addition, indoor pollution (formaldehyde and other organic volatile organic solvents produced by decoration and building materials), human With pet hair and dander, solving air pollution has become an urgent issue.