The most effective additional detail to add to paragraph 3 would be:
A few residents have complained that their health has been affected by being woken at night by loud noises.
This detail provides specific evidence about the impact of noise on residents' well-being, reinforcing the argument that excessive noise can lead to negative health outcomes, which supports the supporters' claims. It gives a clearer picture of the consequences of noise disruptions beyond just inconvenience, making it a compelling addition to the discussion.