

They mean pleasant and safe in their neighborhood. They dont want to have to drive 1 hour out of the city to be able to walk without constant traffic noise or the risk of being injured by a car. A 6 lane stroad is absolutely unpleasant to walk on. Its loud, the air is polluted with emissions, tire dust, and brake dust. It dangerous as there is no meaningful barrier between you and cars, a distracted or drunk driver can easily harm a pedestrian on the sidewalk.
I specifically took a longer route that involved walking up and over a hill to get grocceries because it avoided the busier and congested roads. Walking uphill both ways was more pleasant than the direct, flatter route on a 6 lane road.





There is also something to be said for emission controls. A coal or NG power plant can have much more cleaning and scrubbing processes. It also shifts the emissions that do slip through to a less densely populated area or at least emits it higher in the atmosphere instead of at street level.