Chemometric techniques in distribution, characterisation and source apportionment of polycyclic aromatic hydrocarbons (PAHS) in aquaculture sediments in Malaysia

► PAHs contamination in aquaculture sites ranged from low to moderately high. ► PAHs in fish farms significantly different than oyster farms. ► Sampling sites were grouped according to contamination levels. ► Land based pollution from vehicle emission predominated PAHs. ► Chemomteric techniques provided objective data interpretation and data reduction.