48773document2231IEK_205_-_TEKNOLOGI_KAWALAN_PENCEMARAN_UDARA_MAC_05.pdfapplication/pdf3788482013-07-13 00:45:42http://eprints.usm.my/1514/1/IEK_205_-_TEKNOLOGI_KAWALAN_PENCEMARAN_UDARA_MAC_05.pdf