Noise from bouncing a basketball on concrete IS NOT always well within the noise level someone should tolerate - far from it - same with noise from a barking dog. Noise laws in my area state that the amount of noise in your house from a neighbour's property must be reasonable, at all times, regardless of any windows and doors being open - i.e. best to consider them open if you plan on making noise. If I cannot avoid an annoying noise (except the exceptions - e.g. lawn mower), that occur on a more or less daily basis, from a neighbour, by closing my front door and turning on something noisy (TV/music/etc, at a normal level) - it is too loud - so firstly, I complain to them - once and once only - i.e. so least I tried to keep the Police+/Council out of it - if they tell you to do something abnormal to drown out their noise (e.g. use earphones), or anything unhelpful, simply ignore it - they are proving themselves to be (part of) the problem, not the solution. So, if that doesn't work (i.e. the noise continues), call the local Council and lodge a complaint [beware they may try to deflect you at first - see next paragraph] ... also try calling the Police on the emergency line while the noise is occurring, over and over again - be as annoying to the authorities as your neighbours are to you (or more!) - make them do their job! and yes, you shouldn't have to. For ongoing issues, it helps to read through and become familiar with all relevant sections of local Law Acts and supporting documentation [e.g. from EPA] related to noise/sound - this stuff is possibly freely available online and easy to search through (as it is in my jurisdiction - searchable PDFs). Be prepared - know your rights. Remember - Noise can be an issue outside of prohibited hours (i.e. during the day), if unreasonable. Problems are only ever properly resolved by addressing their root cause - in this case - BB being bouncing on concrete - OR possibly - real root cause - inconsiderate parents allowing their children to make too much noise by bouncing a BB on concrete while being too close to neighbouring properties/buildings, leading to noise issues for them. Everyone's wellbeing should be the goal - especially the wellbeing of the more vulnerable - not just the wellbeing of the noise allowers+/makers, as it seems to be in this day and age. If you want to bounce a proper BB on a hard surface, do it away from other people's homes - far away - or use a BB that doesn't make too much noise!