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Photometry from the Tycho-2, 2MASS, and WISE catalogues for clump and branchgiants at a distance up to 25 kpc toward the Galactic poles has allowed thevariations of various characteristics of the infrared interstellar extinctionlaw with distance to be analyzed. The results obtained by the extinction lawextrapolation method are consistent for different classes of stars anddifferent characteristics as well as with previous studies. The conventionalextinction law with a low infrared extinction is characteristic of only a thinlayer no farther than 100 pc from the Galactic plane and of two thin layersnear $Z=-600$ and $+500$ pc. Far from the Galactic plane, in the Galactic halo,the infrared extinction law is different: the extinction in the $Ks$, $W1$,$W2$, $W3$, and $W4$ bands is, respectively, $0.17$, $0.16$, $0.16$, $0.07$,and $0.03$ of the extinction in the $V$ band. The accuracy of thesecoefficients is $0.03$. If the extinction law reflects primarily the grain sizedistribution, then the fraction of large dust grains far from the Galacticplane is greater than that in the circumsolar interstellar medium.

Extinction Law at a Distance up to 25 kpc toward the Galactic Poles