Extinction trends at high galactic latitudes as shown by extragalactic extinction indicators

In the galactic latitude range 40°<|b|<80° several extinction indicators of extragalactic type show features with similar longitude dependence. Amplitudes of these variations correspond toB-extinction variations of about 0 _. ^m 3–0 _. ^m 4. The results favour the view that instead of nearly zero extinction, there are significant amounts of dust at high galactic latitudes.