Gall sŵn, sy’n golygu sain ddiangen neu niweidiol, yn y byrdymor, amharu ar gwsg a chynyddu lefelau straen, dicter neu flinder, yn ogystal â tharfu ar weithgareddau pwysig megis dysgu, gweithio ac ymlacio. Yn y pen draw, mae’n lleihau ansawdd bywydau pobl. Gall seiniau uchel achosi niwed i’r clyw, tra gall sŵn dros amser hir gynyddu’r risg o gael clefydau sy’n gysylltiedig â phwysedd gwaed uchel a chlefyd cardiofasgwlaidd.
Noise – meaning unwanted or harmful sound – can, in the short term, disrupt sleep and increase levels of stress, irritation and fatigue, as well as interfering with important activities such as learning, working and relaxing. Ultimately, it reduces the quality of people’s lives. Exposure to loud sounds can cause hearing damage, while exposure to noise in the long term can increase the risk of hypertension-related illnesses and cardiovascular disease.