References: A&B: Anderson & Bania (2009); C+: Caswell et al. (1995); CY: Cyganowsky et al. (2009); K: Kolpak et al. (2003; A+: Anderson et al. (in preparation); L89: Lockman (1989); P+: Pandian et al. (2007); P08+: Pandian et al. (2008); R+: Rathborne et al. (2005); S+: Sewilo et al. (2004); SLY: Slysh et al. (1999); SZY00: Szymczak et al. (2000); SZY02: Szymczak et al. (2002); WW: Wienen & Wyrowski, in preparation; W98: Walsh et al. (1998); X+: Xu et al. (2008).

N1: the first velocity measurement concerns the nearby H ii region G10.16 − 0.35, and not directly N1. The distance of 3.4 kpc is that of the exciting cluster of G10.16 − 0.35 (Blum et al. 2001).

N4: we favor the near distance as Hα emission is observed.

N14: we favor the near distance as Hα emission is observed.

N18: the distance is uncertain as the confidence parameters given by A&B are not good.

N24 is a large open bubble. The velocity has been measured in several directions at its border. Two of these are the directions of the UC H ii regions (N24bis1 and N24bis2). These UC H ii regions are most probably physically associated with N24, as they present very similar velocities.

N39 is a large bipolar nebula, on the border of which lies an UC H ii region at 25.397 − 0.140. This H ii region is probably not associated with N39, as it presents a different velocity.

N52: the detailed velocity field of the ionized gas is given by Balser et al. (2001), and the velocity field of the molecular material by Motte et al. (2003).

N53 lies on the border of the large G31.165 − 0.127 H ii region; they are probably linked as they present similar velocities.

N55 lies adjacent to a dense core containing several UC H ii regions. The measured velocity is that of one of these UC H ii region.

N59 is a large bubble. The second observed direction is that of a compact H ii region, on the border of the large bubble. They are possibly associated.

N61 is a large and faint bubble. The measured velocity is that of a nearby UC H ii region. They are most probably associated as they lie on each side of an interacting filament.

The distance of N62 is uncertain. Rathborne et al. (2005) assumed that the nearby IRDC, adjacent to N62 and containing the G34.4 + 0.2 UC H ii region, is at the near kinematical distance; A&B put the UC H ii region at the far distance, but their confidence parameter is not good.

N81 is a large and faint bubble. N82 and N83 are observed respectively on the border and inside the bubble. N82 is clearly linked to N81, on morphological basis. The association is doubful for N83. We adopt for N81 the distance of N82.