Hi.. Try this way..:
SELECT format([The Date],"mm\/yyyy"),
[Aeration Data].[30 Minute Settling Test],
[Aeration Data].[MLSS (mg/L)],
[Aeration Data].[MLVSS (mg/L)],
[Aeration Data].[Ammonia In (mg/L)],
[Aeration Data].[Ammonia Out (mg/L)],
[Aeration Data].[Ortho-Phosphorus In (mg/L)]...