The LOD  (Lowest detection limit) of polycyclic aromatic hydrocarbons (PAHs) is the lowest concentration that can be determined by the detection technique (Hi-tech chromatographic-mass spectrometric instrument) with accuracy and precision. It varies from one PAH to another and also varies with the detection technique.
It is crucial in the estimation of hazardous effects associated with their exposure because it represents the lowest concentration that can be reliably detected and distinguished from background noise in a given analytical method. It helps the researchers and regulators to determine the sensitivity and reliability of analytical methods for determining PAH concentrations and assessing associated consumer health risks.