Mae'r data'n dangos mai Castell-nedd Port Talbot sydd â'r nifer fwyaf o safleoedd gyda 607 ond mai Rhondda Cynon Taf sydd â’r nifer fwyaf o rai risg uwch, sef 75.
The data shows that Neath Port Talbot has the greatest number of sites at 607 but that Rhondda Cynon Taf has the most sites classified as being at higher risk at 75.