We analyze the absorption features in the public 73 ks XMM-Newton spectra of the Seyfert 1 galaxy PG 0052+251. Our analysis reveals the presence of a warm absorber (WA) intrinsic to the source and the hot circumgalactic medium at zero redshift. The identified WA is inflowing toward the central black hole,with a velocity shift of  km s−1. The ionization parameter of the WA is , showing strong O ii and O iii absorption lines, along with a significant absorption of the spectral continuum at ≳10 Å. The line of sight toward PG 0052+251 intersects the halo of M31 at an impact parameter of approximately 218 kpc. Several local (z ∼ 0) absorption lines, like O vii, O viii, and Ne ix, were detected. The derived hydrogen column density of the local hot gas is 2.2–2.6σ higher than those estimated by several models of the Galactic hot halo, suggesting a likely contribution from the M31 halo. We also find two absorption features at 24.305 Å and 21.410 Å, which are unlikely to be associated with the hot halos or the warm-hot intergalactic medium but imply the presence of an additional WA component with an outflow velocity of approximately −7000 km s−1.

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