sentences:  One of them was the shape and locations of the two proposed ventilation shaft buildings near the northern and southern tunnel entries, and their likely effect on local visual amenity (with the shafts, at 25m-27m height, proposed to tower visibly over surrounding suburban areas) and local air pollution levels (where an indepependent report considered that the NZTA had been too optimistic in terms of pollution conditions during traffic jams and due to induced demand).Other matters included effects on local neighbourhoods, even those where demolition was not expected, such as for several apartment buildings directly adjacent to a multi-year construction site.On 9 May 2011 it was reported that the board had directed NZTA to, among other mitigation changes