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並前往https://www.environment.gov.za/sites/default/files/gazetted_notices/nemaqa_ambientair_quality_g35463gen486_0.pdf

~~~MOLEWA - Environmental Affairs

29 June 2012. NATIONAL AMBIENT AIR QUALITY STANDARD FOR PARTICULATE MATTER WITH. AERODYNAMIC DIAMETER LESS THAN 2.5 MICRON METRES (PM2.5).

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