EN
We first show that a linear operator which is bounded on $L²_{w}$ with w ∈ A₁ can be extended to a bounded operator on the weighted local Hardy space $h¹_{w}$ if and only if this operator is uniformly bounded on all $h¹_{w}$-atoms. As an application, we show that every pseudo-differential operator of order zero has a bounded extension to $h¹_{w}$.