2.2 particulate matter from where.The key polluting, throughout the year, including dust from traffic, waste incineration of household and incinerate of waste household. The burned forest area. And burn agricultural sector are born in the 4 months.2.1 particulate matter what happens in nature. Due to strong wind, sand, dust, soil water, dust, salt from the sea, and then spread into the air, the soot from the occurrence of forest fire, explosion. The volcano.2.2 particulate by humans. The source of dust with (Point source) as ventilation, exhaust gas or smoke. In the production process from come factory chimney, industry and household industry, such as burning fuel, coal, firewood, rice milling processes. Machining or welding metal.
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