Gallai'r safleoedd hyn lygru'r amgylchedd a pheryglu iechyd dynol. Maent yn arwain at y perygl o dân, llygredd dŵr ac yn achosi problemau eraill megis arogleuon, sbwriel a phlâu o bryfed sy'n cael effaith ar y cymunedau o amgylch.
These sites can cause pollution to the environment and endanger human health. They pose a risk of fire, water pollution and cause other issues such as odour, litter and fly infestations which affect surrounding communities.