Proposals could see Cilcennin, Ciliau Parc, Dihewyd and Felinfach schools shut and a new area school opened on the Felinfach theatre campus.
But some parents fear the proposed site has pollution from nearby factories and is "not safe" for children.
Councillors deferred a decision on the plans during a meeting on Tuesday.
Ceredigion council want more details on funding available from the Welsh Government before they decide on whether to close the schools.
An informal consultation with parents, governors and carers highlighted concerns about the safety of the potential new school site at Felinfach Professional Education Centre.
Fears included:
Fears were also raised that closing village schools could damage communities, according to the council report.
Cabinet member for education Hag Harris said he appreciated parents' concerns, but that the new area building would not be a "second rate school".
He said: "This will be a really first class school as we have built previously in Ceredigion."
Options before the council had been to continue with the current situation of 10 schools; to close Cilcennin School; or to build a new area school for pupils of Ciliau Parc, Cilcennin, Dihewyd and Felinfach.
The preferred option would be to develop an area school in existing buildings on the Felinfach theatre campus.
The council is restructuring education, saying there are 1,000 fewer children in Ceredigion than a decade ago.
The four schools under threat have a total of 171 pupils.
A decision on controversial plans to close four primary schools in Ceredigion has been put on hold while funding is explored.