  In this paper we provide a consistency relation between the amplitude of the
hemispherical bipolar asymmetry, $A$, and the amplitude of the primordial
non-Gaussianity in the squeezed limit, $f_{NL}$, as $|A| \lesssim 10^{-1}
f_{NL}$. We demonstrate that this consistency condition is at work for any
model of inflation in which the curvature perturbations is sourced by a single
light field with the Bunch-Davies initial condition, irrespective of the number
of inflation fields which contribute to the background inflationary expansion.
As a non-trivial example, we show that observable hemispherical asymmetry can
be generated in single field non-attractor inflationary models. We also study
hemispherical asymmetry generated in the models of multiple fields inflation.
We show that $A$ is controlled by the weighted sum of non-Gaussianity
contribution from each field. In particular, we show that observable
hemispherical asymmetry can be generated in models where inhomogeneities are
generated from a light scalar field modulating the surface of end of inflation.
