  We study the Schwinger effect in near-extremal nonrotating black holes in an
arbitrary $D(\geq 4)$-dimensional asymptotically flat and (A)dS space. Using
the near-horizon geometry $\mathrm{AdS}_2 \times \mathrm{S}^{D-2}$ of
near-extremal black holes with Myers-Perry metric, we find a universal
expression of the emission formula for charges that is a multiplication of the
Schwinger effects in an $\mathrm{AdS}_2$ space and in a two-dimensional Rindler
space. The effective temperature of an accelerated charge for the Schwinger
effect is determined by the radii of the effective $\mathrm{AdS}_2$ space and
$\mathrm{S}^{D-2}$ as well as the mass, charge, angular momentum of the charge
and the radius of the (A)dS space. The Schwinger effect in the asymptotically
flat space is more efficient and persistent for a wide range of large black
holes for dimensions higher than four. The AdS (dS) boundary enhances
(suppresses) the Schwinger effect than the asymptotically flat space. The
Schwinger effect persists for a wide range of black holes in the AdS space and
has an upper bound in the dS space.
