ITV News has learnt that laws preventing the burial of dead animals on farms are to be 'relaxed' for the next seven days.
Farmers have been calling for the change to help them deal with the deaths of hundreds of lambs and ponies following heavy snow in north and mid Wales.
A formal statement from the Welsh Government is expected shortly.
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The pit closed in 1996 with the loss of hundreds of jobs.
Pollen levels will remain moderate tomorrow and Tuesday, but will be lower on Wednesday.
It will be a dry evening for most. A band of rain and thicker cloud will spread from the north overnight, clearing in the early hours.