The physical factors are noise, vibration, smell, fumes, smoke and artificial lighting and the discharge on to the land of any solid or liquid substance.
Y ffactorau ffisegol yw sŵn, dirgryniad, arogl, mygdarthau, mwg a goleuadau artiffisial ac unrhyw sylwedd solet neu hylifol sy’n cael ei ryddhau i'r tir.