Large-field global view toward SNR G150.3+4.5. The upper panel shows an integrated intensity map derived from the ¹²CO emission with a velocity range between −60 and 15 km s⁻¹ (3σ = 4.7 K km s⁻¹). The purple dashed contours represent the Urumqi λ 6 cm radio continuum emission (Gao & Han 2014), and the purple ellipse shows the size of the remnant in the 6 cm radio observations. The contours run at 3.0 + n × 3.0 mK (n = 1, 2,… 5). The orange and green circles represent the very high energy source 1LHAASO J0428+5531 (Cao et al. 2024), with orange indicating KM2A component and green denoting the WCDA component. The red circles represent two SNR candidates G151.2+2.9 (Kerton et al. 2007) and G149.5+3.2 (Gerbrandt et al. 2014). The bottom panel depicts the average spectra of the regions marked in the upper panel with the rectangle, with the spectra of ¹²CO (blue) and ¹³CO (red). The annotations on the spectra pinpoint the velocity ranges of individual components.