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New PM2 5 standard will alarm public

New PM2 5 standard will alarm public
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Krung thep mahanakhonChiang raiSamut prakanChiang maiSara buriApichart jinakulWorld health organizationAssociation of southeast asian nations aseanChiang rai public relations officeEuropean environment agencyPollution control departmentThailand national environmental boardUs environmental protection agencyRoyal thai navySoutheast asian nationsNational environmental board