Molecular gas density in the MQN01 field for galaxies within |Δv_QSO|< 1000 km s⁻¹ (red star) compared to results in blank fields from HDF-N+ASPECS-LP (Boogaard et al. 2023), ASPECS-LP (Decarli et al. 2019, 2020), PHIBBS2 (Lenkić et al. 2020), COLDz (Riechers et al. 2019), VLASPECS (Riechers et al. 2020), and the xCOLD GASS survey (Fletcher et al. 2021). We also report measurements of the cosmic molecular gas density obtained via dust continuum (gray bars; Berta et al. 2013; Scoville et al. 2017; Magnelli et al. 2020) and the best-fitting function from Walter et al. (2020). The green symbol is the molecular gas density in the Spiderweb protocluster (Jin et al. 2021).