The largest contributing sector in Wales is cattle: cattle manure management (livestock housing, manure storage and outdoor yards) and its land application make 70% of all NH3 emissions.
Ffermydd pori da byw yn yr ALFf yw cyfran fwyaf y ffermydd a’r tir yng Nghymru, gan gyfrif am dau traean (66%) o’r holl fathau o ffermydd a bron dri chwarter (73%) o’r tir yng Nghymru.