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The location of warm dust producing the mid-infrared (MIR) emission in type 1 active galactic nuclei (AGNs) is complex and not yet fully known. We explore this problem by studying how the MIR covering factor (CF MIR = L MIR /L bol ) correlates with the fundamental parameters of AGN accretion process (such as L bol , black hole mass M BH , and Eddington ratio L/L Edd ) and the properties of narrow emission lines (as represented by [O iii] λ5007), using large data sets derived from the Sloandoi:10.1088/0026-1394/41/4/016 fatcat:ar3kkyhgmre7zko3owxpufaxi4