What is the LOD of polycyclic aromatic hydrocarbons (PAHs)? what is it`s importance in estimation of the hazardous effect of exposure to PAHs?

 The analytical technique, equipment, and sample matrix all affect the polycyclic aromatic hydrocarbons (PAHs) limit of detection (LOD). The lowest concentration of a material that is continuously measurable but not always identifiable is known to as LOD. When calculating the harmful effects of polycyclic aromatic hydrocarbons (PAHs), especially when evaluating exposure to humans and the environment, the Limit of Detection (LOD) is crucial. Early detection in the environment, water, soil, and biological samples is guaranteed by a low LOD, that facilitates environmental monitoring, risk assessment, and regulatory compliance. By enabling in recognizing of low-level and chronic exposure, it makes it possible to create mitigation plans that safeguard ecosystems and human health. Therefore, precise LODs are necessary for properly evaluating and controlling PAH-related risks. 

Concerning LOD: even at the limit of detection, they will act as usual for toxic in synergy with other pollutants. So, this should be limited as much as possible into the environment.

The review Polycyclic Aromatic Hydrocarbons (PAHs) and their Derivatives (O-PAHs, N-PAHs, OH-PAHs): Determination in Suspended Particulate Matter (SPM) - a review by Nowakowski M et al ., 2022 Environ. Process. issue 9 may help you understand the concepts further. 

LOD stands for limit of detection and it is expressed in concentration/content units. This analytical parameter is calculated for every compound belonging to PAHs, or other, individually, and for every analytical method, and for every sample type. `Group` LOD can not be calculated for all PAHs. This value denotes the lowest concentration that specific analytical methods can detect in specific sample, by applying specific sample preparation and specific analytical method. Specific compound can still be present in the sample but remain undetected, if its concentration in the sample is below LOD. LOD denotes that you can detect a compound within specific uncertainty range.

This parameter has nothing to do with estimation of hazardous effects of exposure. Other parameters are relevant here.