Mae'r ymgynghoriad ar y pecyn terfynol o fesurau i wella ansawdd yr aer yn y pum lleoliad hyn, a elwir yn Gam 3 WelTAG, yn ychwanegu at yr ymarfer ymgynghori a gynhaliwyd ym mis Ebrill 2018 ar ganfyddiadau Cam 1 a Cham 2. Bydd hefyd yn gofyn am farn am y terfynau cyflymder o 50mya.
The consultation on the final package of measures for improvements to air quality at these five sites, known as WelTAG Stage Three, is further to the consultation exercise that took place back in April 2018 on the Stage One and Stage Two findings. It will also look for opinions on the 50mph speed limits.