Generally, pollen levels in December are very low. However, starting in mid-December we may see some Juniperus ashei (mountain cedar) pollen in our air samples. Mountain cedar trees are found in central Texas and south central Oklahoma and release pollen in December and January. On warm sunny days with south to southwest winds some of the pollen may reach Tulsa, possibly in high concentrations. See information on mountain cedar on the Winter Pollen and the Juniperus ashei pages.