Greeting Season of PM 2.5

        Particle size not over 2.5 micron as comparing 1/25 of human hair that a capability of nose hair counld not filter, so micro particle size easy disfusing to human respiratory system. A major cause of pollution PM2.5 in Thailand is outdoor burning. This conventional activity purpose to prepare agricutural land , weed disposing , and agricultural waste disposing. The secondary cause is specific to industrial sector and transportation sector respectively. Mostly harvesting area in the northern region on plateau and remote from the city that is disadvantage to transport agricultural waste to utilize as fuel in powerplant.