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Elevated Particular Matter (PM_2.5) may increase the risk of acquiring hazardous health implications, and hence high-performance monitoring of minuscule contaminants might protect people&#x0027;s health. The adsorption behaviour of specific PM_2.5 contaminants on doped&#x002F;undoped monolayer&#x002F;bilayer armchair graphene nanoribbon (ArGNR) is analyzed using a hydrogen-passivated layer. By using the first-principles density functional theory (DFT), the influence of doping on the ArGNR substrate is carefully examined. Due to the fragile surface atoms, monolayer ArGNR exhibits roughly twice the adsorption energy compared to the bilayer configuration. However, the specific PM_2.5 contaminants, the CH₄, NH₃, and NO₂ molecules demonstrate chemisorption of &#x2212;2 eV,&#x2212;2.95 eV, and &#x2212;4 eV, with extremely less bandgap variation of &#x2212;65&#x0025; to &#x2212;70&#x0025; and &#x2212;100&#x0025; and a gigantic amount of charge transfer of &#x002B;0.153 eV, &#x002B;0.156 eV and &#x002B;0.010 eV, and the DOS peaks at B site are <inline-formula><tex-math notation="LaTeX">$ \pm 110\,\text{eV}, \pm 65{\rm{ eV}}, \pm 80{\rm{ eV}}$</tex-math></inline-formula>, and at the P site are <inline-formula><tex-math notation="LaTeX">$ \pm 130$</tex-math></inline-formula> eV, <inline-formula><tex-math notation="LaTeX">$ \pm 300$</tex-math></inline-formula> eV and <inline-formula><tex-math notation="LaTeX">$ \pm 80$</tex-math></inline-formula> eV on boron-phosphorus (BP) co-doped monolayer ArGNR, for CH₄, NH_3, and NO₂, respectively.