It has been recently proposed that the broad line region in active galactic nuclei originates from dusty clouds driven from the accretion disk by radiation pressure , at a distance from the black hole where the disk is cooler than the dust sublimation temperature . We test this scenario by checking the consistency of independent broad line region and accretion disk reverberation measurements , for a sample of 11 well studied active galactic nuclei . We show that independent disk and broad line region reverberation mapping measurements are compatible with a universal disk temperature at the H \beta radius of T ( R _ { H \beta } ) \approx 1670 \pm 231 K which is close to typical dust sublimation temperatures .